Initial commit: Activiteiten Inventaris applicatie

2026-01-06 01:23:45 +01:00
commit 6d26aea0cf
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--- a/.dockerignore
+++ b/.dockerignore
@@ -0,0 +1,9 @@
+node_modules
+npm-debug.log
+.git
+.gitignore
+.env
+*.md
+data/
+.DS_Store
+dist/
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,7 @@
+node_modules/
+dist/
+data/
+*.db
+.env
+.DS_Store
+npm-debug.log
--- a/DEPLOYMENT.md
+++ b/DEPLOYMENT.md
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+# Deployment naar Dockge (Home Server)
+
+Deze handleiding beschrijft hoe je de Activiteiten Inventaris applicatie deployt naar je home server met Dockge, Gitea en Nginx Proxy Manager.
+
+## Overzicht
+
+- **Gitea**: Lokale Git server voor versiebeheer
+- **Dockge**: Docker Compose stack manager
+- **Nginx Proxy Manager**: Reverse proxy met SSL
+- **Domein**: poll.hausmans.cloud
+
+---
+
+## Stap 1: Repository aanmaken in Gitea
+
+### 1.1 Lokale Git repository initialiseren
+
+Voer deze commando's uit in de project directory op je ontwikkelmachine:
+
+```bash
+cd /Users/berthausmans/Documents/Development/questionnaire
+
+# Git repository initialiseren
+git init
+
+# Alle bestanden toevoegen
+git add .
+
+# Eerste commit maken
+git commit -m "Initial commit: Activiteiten Inventaris applicatie"
+```
+
+### 1.2 Repository aanmaken in Gitea
+
+1. Open Gitea in je browser (bijv. `http://gitea.local:3000`)
+2. Klik op **"+"** → **"New Repository"**
+3. Vul in:
+   - **Repository Name**: `questionnaire`
+   - **Visibility**: Private (aanbevolen)
+   - **Initialize repository**: ❌ Niet aanvinken (we pushen bestaande code)
+4. Klik op **"Create Repository"**
+
+### 1.3 Code pushen naar Gitea
+
+```bash
+# Remote toevoegen (vervang met je Gitea URL)
+git remote add origin http://gitea.local:3000/jouw-gebruiker/questionnaire.git
+
+# Code pushen
+git push -u origin main
+```
+
+> **Tip**: Als je branch `master` heet i.p.v. `main`:
+> ```bash
+> git branch -M main
+> git push -u origin main
+> ```
+
+---
+
+## Stap 2: Repository clonen op de server
+
+SSH naar je Proxmox server en clone de repository:
+
+```bash
+# Ga naar de Dockge stacks directory
+cd /opt/stacks
+
+# Clone de repository van Gitea
+git clone http://gitea.local:3000/jouw-gebruiker/questionnaire.git
+```
+
+> **Authenticatie**: Je wordt gevraagd om je Gitea gebruikersnaam en wachtwoord.
+> Tip: Maak een Access Token aan in Gitea (Settings → Applications → Generate New Token)
+
+---
+
+## Stap 3: Stack aanmaken in Dockge
+
+1. Open Dockge in je browser (bijv. `http://server-ip:5001`)
+2. Klik op **"+ Compose"** om een nieuwe stack aan te maken
+3. Geef de stack een naam: `questionnaire`
+4. Plak de volgende `docker-compose.yml`:
+
+```yaml
+version: '3.8'
+
+services:
+  app:
+    build: .
+    container_name: questionnaire
+    ports:
+      - "4000:4000"
+    environment:
+      - NODE_ENV=production
+      - PORT=4000
+      - SESSION_SECRET=${SESSION_SECRET}
+      - DB_PATH=/app/data/questionnaire.db
+      - DEFAULT_ADMIN_USER=${DEFAULT_ADMIN_USER:-admin}
+      - DEFAULT_ADMIN_PASS=${DEFAULT_ADMIN_PASS}
+    volumes:
+      - ./data:/app/data
+    restart: unless-stopped
+    networks:
+      - proxy
+
+networks:
+  proxy:
+    external: true
+```
+
+5. Maak een `.env` bestand aan (via Dockge's Environment tab) met:
+
+```env
+SESSION_SECRET=jouw-super-geheime-sleutel-hier-minimaal-32-tekens
+DEFAULT_ADMIN_USER=admin
+DEFAULT_ADMIN_PASS=jouw-veilige-wachtwoord
+```
+
+> ⚠️ **Belangrijk**: Gebruik sterke, unieke waarden voor `SESSION_SECRET` en `DEFAULT_ADMIN_PASS`!
+
+---
+
+## Stap 3: Docker netwerk aanmaken (eenmalig)
+
+Als je nog geen `proxy` netwerk hebt, maak deze aan via SSH op je server:
+
+```bash
+docker network create proxy
+```
+
+Dit netwerk wordt gebruikt om de applicatie te verbinden met Nginx Proxy Manager.
+
+---
+
+## Stap 4: Stack deployen
+
+1. In Dockge, klik op **"Deploy"** of **"Up"**
+2. Wacht tot de image is gebouwd en de container draait
+3. Test of de applicatie werkt: `http://server-ip:4000`
+
+---
+
+## Stap 5: Nginx Proxy Manager configureren
+
+1. Open Nginx Proxy Manager (bijv. `http://server-ip:81`)
+2. Ga naar **Proxy Hosts** → **Add Proxy Host**
+
+### Details tab:
+
+| Veld | Waarde |
+|------|--------|
+| Domain Names | `poll.hausmans.cloud` |
+| Scheme | `http` |
+| Forward Hostname / IP | `questionnaire` (container naam) |
+| Forward Port | `4000` |
+| Block Common Exploits | ✅ |
+| Websockets Support | ❌ (niet nodig) |
+
+### SSL tab:
+
+| Veld | Waarde |
+|------|--------|
+| SSL Certificate | Request a new SSL Certificate |
+| Force SSL | ✅ |
+| HTTP/2 Support | ✅ |
+| HSTS Enabled | ✅ (optioneel) |
+| Email Address | jouw@email.com |
+| I Agree... | ✅ |
+
+3. Klik op **Save**
+
+---
+
+## Stap 6: DNS configureren
+
+Zorg dat je domein `poll.hausmans.cloud` naar je home IP-adres wijst:
+
+| Type | Naam | Waarde |
+|------|------|--------|
+| A | poll | jouw-publieke-ip |
+
+Of als je een dynamisch IP hebt, gebruik CNAME met een DynDNS service.
+
+---
+
+## Stap 7: Router port forwarding
+
+Zorg dat je router poorten doorstuurt naar Nginx Proxy Manager:
+
+| Externe poort | Interne poort | Protocol | Doel IP |
+|--------------|---------------|----------|---------|
+| 80 | 80 | TCP | NPM server IP |
+| 443 | 443 | TCP | NPM server IP |
+
+---
+
+## Verificatie
+
+1. Ga naar `https://poll.hausmans.cloud`
+2. Je zou de login pagina moeten zien
+3. Log in met je admin credentials
+
+---
+
+## Troubleshooting
+
+### Container start niet
+
+```bash
+# Bekijk logs
+docker logs questionnaire
+
+# Of in Dockge, klik op de container en bekijk logs
+```
+
+### Database permissies
+
+```bash
+# Zorg dat de data directory schrijfbaar is
+chmod 755 /opt/stacks/questionnaire/data
+```
+
+### Netwerk problemen
+
+```bash
+# Controleer of container in proxy netwerk zit
+docker network inspect proxy
+```
+
+### NPM kan container niet bereiken
+
+Zorg dat beide containers (questionnaire en NPM) in hetzelfde Docker netwerk zitten (`proxy`).
+
+---
+
+## Updates deployen
+
+### Vanaf je ontwikkelmachine
+
+```bash
+cd /Users/berthausmans/Documents/Development/questionnaire
+
+# Wijzigingen toevoegen en committen
+git add .
+git commit -m "Beschrijving van je wijzigingen"
+
+# Pushen naar Gitea
+git push
+```
+
+### Op de server (via SSH of Dockge terminal)
+
+```bash
+cd /opt/stacks/questionnaire
+
+# Laatste wijzigingen ophalen
+git pull
+```
+
+### In Dockge
+
+1. Open de `questionnaire` stack
+2. Klik op **"Down"** (stop de stack)
+3. Klik op **"Rebuild"** om de image opnieuw te bouwen
+4. Klik op **"Up"** om de stack te starten
+
+> **Tip**: Je kunt stap 2-4 ook combineren met de "Recreate" optie als beschikbaar.
+
+---
+
+## Backup
+
+De database wordt opgeslagen in `./data/questionnaire.db`. Maak regelmatig backups:
+
+```bash
+cp /opt/stacks/questionnaire/data/questionnaire.db ~/backups/questionnaire-$(date +%Y%m%d).db
+```
+
+---
+
+## Volledige workflow samenvatting
+
+```
+┌─────────────────┐     git push     ┌─────────────────┐
+│  Ontwikkelmachine │ ─────────────► │     Gitea       │
+│  (lokaal)        │                 │  (lokaal netwerk)│
+└─────────────────┘                 └────────┬────────┘
+                                             │ git pull
+                                             ▼
+                                    ┌─────────────────┐
+                                    │  Dockge/Server  │
+                                    │  (Proxmox)      │
+                                    └────────┬────────┘
+                                             │ docker build
+                                             ▼
+                                    ┌─────────────────┐
+                                    │  Docker Container│
+                                    │  (port 4000)    │
+                                    └────────┬────────┘
+                                             │
+                                             ▼
+                                    ┌─────────────────┐
+                                    │ Nginx Proxy Mgr │
+                                    │ + Let's Encrypt │
+                                    └────────┬────────┘
+                                             │
+                                             ▼
+                                    ┌─────────────────┐
+                                    │   Internet      │
+                                    │ poll.hausmans.cloud
+                                    └─────────────────┘
+```
+
--- a/54
+++ b/54
@@ -0,0 +1,54 @@
+# Build stage
+FROM node:20-alpine AS builder
+
+# Install build dependencies for better-sqlite3
+RUN apk add --no-cache python3 make g++
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install all dependencies (including devDependencies for build)
+RUN npm install
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Compile server TypeScript
+RUN npx tsc -p tsconfig.server.json
+
+# Production stage
+FROM node:20-alpine
+
+# Install build dependencies for better-sqlite3
+RUN apk add --no-cache python3 make g++
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install production dependencies only
+RUN npm install --omit=dev
+
+# Copy built files from builder
+COPY --from=builder /app/dist ./dist
+
+# Create data directory
+RUN mkdir -p /app/data
+
+# Expose port
+EXPOSE 4000
+
+# Set environment variables
+ENV NODE_ENV=production
+ENV PORT=4000
+ENV SESSION_SECRET=change-this-in-production
+ENV DB_PATH=/app/data/questionnaire.db
+
+# Start the application
+CMD ["node", "dist/server/index.js"]
--- a/README.md
+++ b/README.md
@@ -0,0 +1,142 @@
+# Activity Inventory - Questionnaire Voting App
+
+A web application that allows admins to create shareable questionnaires where users can add activities and vote on them using upvotes and downvotes.
+
+## Tech Stack
+
+- **Frontend**: React 18, TypeScript, Vite, Tailwind CSS
+- **Backend**: Express.js, TypeScript
+- **Database**: SQLite with `better-sqlite3`
+- **Containerization**: Docker with multi-stage build
+
+## Features
+
+- **Admin Dashboard**: Create and manage questionnaires with unique shareable URLs
+- **User Management**: Add/remove admin users and change passwords
+- **Public Voting**: Share questionnaire URLs for users to add activities and vote
+- **Upvote/Downvote System**: Users can upvote or downvote activities
+- **Comments**: Users can comment on activities and reply to comments
+- **Name Persistence**: Visitor names are stored in cookies for 30 days
+- **Docker Support**: Easy deployment with Docker and docker-compose
+
+## Quick Start with Docker
+
+1. Clone the repository and navigate to the project directory
+
+2. Start the application:
+   ```bash
+   docker-compose up -d --build
+   ```
+
+3. Access the app at `http://localhost:4000`
+
+4. Login with default credentials:
+   - Username: `admin`
+   - Password: `admin123`
+
+5. Create a questionnaire and share the unique URL with participants
+
+## Development Setup
+
+1. Install dependencies:
+   ```bash
+   npm install
+   ```
+
+2. Start the development servers (frontend + backend):
+   ```bash
+   npm run dev
+   ```
+
+3. Access the app at `http://localhost:5177` (Vite dev server)
+   - API requests are proxied to `http://localhost:4000`
+
+## Configuration
+
+Environment variables can be set in `docker-compose.yml` or via a `.env` file:
+
+| Variable | Description | Default |
+|----------|-------------|---------|
+| `PORT` | Server port | `4000` |
+| `SESSION_SECRET` | Secret for session encryption | `super-secret-session-key-change-me` |
+| `DB_PATH` | SQLite database path | `/app/data/questionnaire.db` |
+| `DEFAULT_ADMIN_USER` | Default admin username | `admin` |
+| `DEFAULT_ADMIN_PASS` | Default admin password | `admin123` |
+
+## Project Structure
+
+```
+questionnaire/
+├── docker-compose.yml      # Docker Compose configuration
+├── Dockerfile              # Multi-stage Docker build
+├── package.json            # Node.js dependencies
+├── vite.config.ts          # Vite configuration
+├── tailwind.config.js      # Tailwind CSS configuration
+├── tsconfig.json           # TypeScript configuration
+├── index.html              # HTML entry point
+├── server/                 # Express backend (TypeScript)
+│   ├── index.ts            # Server entry point
+│   ├── database.ts         # SQLite database operations
+│   ├── middleware/
+│   │   └── auth.ts
+│   └── routes/
+│       ├── admin.ts
+│       ├── auth.ts
+│       └── questionnaire.ts
+└── src/                    # React frontend (TypeScript)
+    ├── main.tsx            # React entry point
+    ├── App.tsx             # App router
+    ├── index.css           # Tailwind imports
+    ├── context/
+    │   └── AuthContext.tsx
+    ├── components/
+    │   ├── AdminLayout.tsx
+    │   └── ProtectedRoute.tsx
+    └── pages/
+        ├── Login.tsx
+        ├── Dashboard.tsx
+        ├── QuestionnaireForm.tsx
+        ├── QuestionnaireDetail.tsx
+        ├── Users.tsx
+        ├── ChangePassword.tsx
+        ├── PublicQuestionnaire.tsx
+        └── NotFound.tsx
+```
+
+## API Endpoints
+
+### Public Routes
+- `GET /api/q/:uuid` - Get questionnaire data
+- `POST /api/q/:uuid/set-name` - Set visitor name
+- `POST /api/q/:uuid/activities` - Add an activity
+- `POST /api/q/:uuid/activities/:id/vote` - Vote on an activity
+- `GET /api/q/:uuid/activities/:id/comments` - Get comments
+- `POST /api/q/:uuid/activities/:id/comments` - Add a comment
+
+### Auth Routes
+- `GET /api/auth/status` - Check authentication status
+- `POST /api/auth/login` - Login
+- `POST /api/auth/logout` - Logout
+
+### Admin Routes (requires authentication)
+- `GET /api/admin/questionnaires` - List all questionnaires
+- `POST /api/admin/questionnaires` - Create questionnaire
+- `GET /api/admin/questionnaires/:id` - Get questionnaire details
+- `PUT /api/admin/questionnaires/:id` - Update questionnaire
+- `DELETE /api/admin/questionnaires/:id` - Delete questionnaire
+- `DELETE /api/admin/activities/:id` - Delete activity
+- `GET /api/admin/users` - List all users
+- `POST /api/admin/users` - Create user
+- `DELETE /api/admin/users/:id` - Delete user
+- `POST /api/admin/change-password` - Change password
+
+## Security Notes
+
+- Change the default admin password immediately after first login
+- Set a strong `SESSION_SECRET` in production
+- The application uses bcrypt for password hashing
+- Session cookies are HTTP-only
+
+## License
+
+MIT
--- a/docker-compose.prod.yml
+++ b/docker-compose.prod.yml
@@ -0,0 +1,34 @@
+version: '3.8'
+
+# Productie configuratie voor Dockge deployment
+# Kopieer deze inhoud naar Dockge bij het aanmaken van de stack
+
+services:
+  app:
+    build: .
+    container_name: questionnaire
+    ports:
+      - "4000:4000"
+    environment:
+      - NODE_ENV=production
+      - PORT=4000
+      - SESSION_SECRET=${SESSION_SECRET}
+      - DB_PATH=/app/data/questionnaire.db
+      - DEFAULT_ADMIN_USER=${DEFAULT_ADMIN_USER:-admin}
+      - DEFAULT_ADMIN_PASS=${DEFAULT_ADMIN_PASS}
+    volumes:
+      - ./data:/app/data
+    restart: unless-stopped
+    networks:
+      - proxy
+    healthcheck:
+      test: ["CMD", "wget", "-q", "--spider", "http://localhost:4000/api/auth/status"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+
+networks:
+  proxy:
+    external: true
+
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -0,0 +1,20 @@
+version: '3.8'
+
+services:
+  app:
+    build: .
+    ports:
+      - "4000:4000"
+    environment:
+      - NODE_ENV=production
+      - PORT=4000
+      - SESSION_SECRET=${SESSION_SECRET:-super-secret-session-key-change-me}
+      - DB_PATH=/app/data/questionnaire.db
+      - DEFAULT_ADMIN_USER=${DEFAULT_ADMIN_USER:-admin}
+      - DEFAULT_ADMIN_PASS=${DEFAULT_ADMIN_PASS:-admin123}
+    volumes:
+      - questionnaire-data:/app/data
+    restart: unless-stopped
+
+volumes:
+  questionnaire-data:
--- a/index.html
+++ b/index.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html lang="nl">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Activiteiten Inventaris</title>
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
+
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@@ -0,0 +1,45 @@
+{
+  "name": "questionnaire-voting-app",
+  "version": "2.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "concurrently \"npm run dev:server\" \"npm run dev:client\"",
+    "dev:client": "vite",
+    "dev:server": "tsx watch server/index.ts",
+    "build": "tsc -b && vite build",
+    "start": "NODE_ENV=production node dist/server/index.js",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "bcrypt": "^5.1.1",
+    "better-sqlite3": "^9.4.3",
+    "cookie-parser": "^1.4.6",
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "express-session": "^1.17.3",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-router-dom": "^6.22.0",
+    "uuid": "^9.0.1"
+  },
+  "devDependencies": {
+    "@types/bcrypt": "^5.0.2",
+    "@types/better-sqlite3": "^7.6.8",
+    "@types/cookie-parser": "^1.4.6",
+    "@types/cors": "^2.8.17",
+    "@types/express": "^4.17.21",
+    "@types/express-session": "^1.18.0",
+    "@types/node": "^22.10.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "@types/uuid": "^10.0.0",
+    "@vitejs/plugin-react": "^4.3.4",
+    "autoprefixer": "^10.4.20",
+    "concurrently": "^9.1.0",
+    "postcss": "^8.4.49",
+    "tailwindcss": "^3.4.17",
+    "tsx": "^4.19.0",
+    "typescript": "^5.7.2",
+    "vite": "^6.2.0"
+  }
+}
--- a/postcss.config.js
+++ b/postcss.config.js
@@ -0,0 +1,7 @@
+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}
+
--- a/public/vite.svg
+++ b/public/vite.svg
@@ -0,0 +1 @@
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--- a/server/database.ts
+++ b/server/database.ts
@@ -0,0 +1,438 @@
+import Database from 'better-sqlite3';
+import bcrypt from 'bcrypt';
+import path from 'path';
+import fs from 'fs';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const dbPath = process.env.DB_PATH || path.join(__dirname, '..', 'data', 'questionnaire.db');
+
+// Ensure data directory exists
+const dataDir = path.dirname(dbPath);
+if (!fs.existsSync(dataDir)) {
+  fs.mkdirSync(dataDir, { recursive: true });
+}
+
+export const db = new Database(dbPath);
+
+// Enable foreign keys
+db.pragma('foreign_keys = ON');
+
+// Types
+export interface User {
+  id: number;
+  username: string;
+  password_hash: string;
+  created_at: string;
+}
+
+export interface Questionnaire {
+  id: number;
+  uuid: string;
+  slug: string;
+  title: string;
+  description: string | null;
+  is_private: boolean;
+  created_by: number;
+  created_at: string;
+  creator_name?: string;
+  activity_count?: number;
+}
+
+export interface Participant {
+  id: number;
+  questionnaire_id: number;
+  name: string;
+  token: string;
+  created_at: string;
+}
+
+export interface Activity {
+  id: number;
+  questionnaire_id: number;
+  name: string;
+  description: string | null;
+  added_by: string;
+  created_at: string;
+  upvotes?: number;
+  downvotes?: number;
+  net_votes?: number;
+  comment_count?: number;
+}
+
+export interface Vote {
+  id: number;
+  activity_id: number;
+  voter_name: string;
+  vote_type: number;
+  created_at: string;
+}
+
+export interface Comment {
+  id: number;
+  activity_id: number;
+  parent_id: number | null;
+  author_name: string;
+  content: string;
+  created_at: string;
+  replies?: Comment[];
+}
+
+// Initialize database schema
+export function initializeDatabase(): void {
+  // Users table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS users (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      username TEXT UNIQUE NOT NULL,
+      password_hash TEXT NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+    )
+  `);
+
+  // Questionnaires table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS questionnaires (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      uuid TEXT UNIQUE NOT NULL,
+      slug TEXT UNIQUE NOT NULL,
+      title TEXT NOT NULL,
+      description TEXT,
+      created_by INTEGER,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      FOREIGN KEY (created_by) REFERENCES users(id)
+    )
+  `);
+  
+  // Migration: Add slug column if it doesn't exist
+  try {
+    db.exec(`ALTER TABLE questionnaires ADD COLUMN slug TEXT`);
+    db.exec(`UPDATE questionnaires SET slug = uuid WHERE slug IS NULL`);
+  } catch (e) {
+    // Column already exists, ignore
+  }
+  
+  // Migration: Add is_private column if it doesn't exist
+  try {
+    db.exec(`ALTER TABLE questionnaires ADD COLUMN is_private INTEGER DEFAULT 0`);
+  } catch (e) {
+    // Column already exists, ignore
+  }
+  
+  // Participants table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS participants (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      questionnaire_id INTEGER NOT NULL,
+      name TEXT NOT NULL,
+      token TEXT UNIQUE NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      FOREIGN KEY (questionnaire_id) REFERENCES questionnaires(id) ON DELETE CASCADE
+    )
+  `);
+  
+  db.exec(`
+    CREATE INDEX IF NOT EXISTS idx_participants_questionnaire ON participants(questionnaire_id);
+    CREATE INDEX IF NOT EXISTS idx_participants_token ON participants(token);
+  `);
+
+  // Activities table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS activities (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      questionnaire_id INTEGER NOT NULL,
+      name TEXT NOT NULL,
+      added_by TEXT NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      FOREIGN KEY (questionnaire_id) REFERENCES questionnaires(id) ON DELETE CASCADE
+    )
+  `);
+  
+  // Migration: Add description column to activities if it doesn't exist
+  try {
+    db.exec(`ALTER TABLE activities ADD COLUMN description TEXT`);
+  } catch (e) {
+    // Column already exists, ignore
+  }
+
+  // Votes table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS votes (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      activity_id INTEGER NOT NULL,
+      voter_name TEXT NOT NULL,
+      vote_type INTEGER NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE,
+      UNIQUE(activity_id, voter_name)
+    )
+  `);
+
+  // Comments table
+  db.exec(`
+    CREATE TABLE IF NOT EXISTS comments (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      activity_id INTEGER NOT NULL,
+      parent_id INTEGER,
+      author_name TEXT NOT NULL,
+      content TEXT NOT NULL,
+      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+      FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE,
+      FOREIGN KEY (parent_id) REFERENCES comments(id) ON DELETE CASCADE
+    )
+  `);
+
+  // Create indexes
+  db.exec(`
+    CREATE INDEX IF NOT EXISTS idx_questionnaires_uuid ON questionnaires(uuid);
+    CREATE INDEX IF NOT EXISTS idx_activities_questionnaire ON activities(questionnaire_id);
+    CREATE INDEX IF NOT EXISTS idx_votes_activity ON votes(activity_id);
+    CREATE INDEX IF NOT EXISTS idx_comments_activity ON comments(activity_id);
+    CREATE INDEX IF NOT EXISTS idx_comments_parent ON comments(parent_id);
+  `);
+
+  // Create default admin user if none exists
+  createDefaultAdmin();
+}
+
+function createDefaultAdmin(): void {
+  const adminUser = process.env.DEFAULT_ADMIN_USER || 'admin';
+  const adminPass = process.env.DEFAULT_ADMIN_PASS || 'admin123';
+  
+  const existingUser = db.prepare('SELECT id FROM users WHERE username = ?').get(adminUser);
+  
+  if (!existingUser) {
+    const hash = bcrypt.hashSync(adminPass, 10);
+    db.prepare('INSERT INTO users (username, password_hash) VALUES (?, ?)').run(adminUser, hash);
+    console.log(`Default admin user '${adminUser}' created.`);
+  }
+}
+
+// User operations
+export const userOps = {
+  findByUsername: (username: string): User | undefined => {
+    return db.prepare('SELECT * FROM users WHERE username = ?').get(username) as User | undefined;
+  },
+  
+  findById: (id: number): Omit<User, 'password_hash'> | undefined => {
+    return db.prepare('SELECT id, username, created_at FROM users WHERE id = ?').get(id) as Omit<User, 'password_hash'> | undefined;
+  },
+  
+  getAll: (): Omit<User, 'password_hash'>[] => {
+    return db.prepare('SELECT id, username, created_at FROM users ORDER BY created_at DESC').all() as Omit<User, 'password_hash'>[];
+  },
+  
+  create: (username: string, password: string): number => {
+    const hash = bcrypt.hashSync(password, 10);
+    const result = db.prepare('INSERT INTO users (username, password_hash) VALUES (?, ?)').run(username, hash);
+    return result.lastInsertRowid as number;
+  },
+  
+  updatePassword: (id: number, newPassword: string): void => {
+    const hash = bcrypt.hashSync(newPassword, 10);
+    db.prepare('UPDATE users SET password_hash = ? WHERE id = ?').run(hash, id);
+  },
+  
+  delete: (id: number): void => {
+    db.prepare('DELETE FROM users WHERE id = ?').run(id);
+  },
+  
+  verifyPassword: (user: User, password: string): boolean => {
+    return bcrypt.compareSync(password, user.password_hash);
+  },
+  
+  count: (): number => {
+    const result = db.prepare('SELECT COUNT(*) as count FROM users').get() as { count: number };
+    return result.count;
+  },
+};
+
+// Questionnaire operations
+export const questionnaireOps = {
+  create: (uuid: string, slug: string, title: string, description: string | null, isPrivate: boolean, createdBy: number): number => {
+    const result = db.prepare(
+      'INSERT INTO questionnaires (uuid, slug, title, description, is_private, created_by) VALUES (?, ?, ?, ?, ?, ?)'
+    ).run(uuid, slug, title, description, isPrivate ? 1 : 0, createdBy);
+    return result.lastInsertRowid as number;
+  },
+  
+  findBySlug: (slug: string): Questionnaire | undefined => {
+    return db.prepare('SELECT * FROM questionnaires WHERE slug = ?').get(slug) as Questionnaire | undefined;
+  },
+  
+  findByUuid: (uuid: string): Questionnaire | undefined => {
+    return db.prepare('SELECT * FROM questionnaires WHERE uuid = ?').get(uuid) as Questionnaire | undefined;
+  },
+  
+  findById: (id: number): Questionnaire | undefined => {
+    return db.prepare('SELECT * FROM questionnaires WHERE id = ?').get(id) as Questionnaire | undefined;
+  },
+  
+  getAll: (): Questionnaire[] => {
+    return db.prepare(`
+      SELECT q.*, u.username as creator_name,
+        (SELECT COUNT(*) FROM activities WHERE questionnaire_id = q.id) as activity_count
+      FROM questionnaires q
+      LEFT JOIN users u ON q.created_by = u.id
+      ORDER BY q.created_at DESC
+    `).all() as Questionnaire[];
+  },
+  
+  update: (id: number, slug: string, title: string, description: string | null, isPrivate: boolean): void => {
+    db.prepare('UPDATE questionnaires SET slug = ?, title = ?, description = ?, is_private = ? WHERE id = ?').run(slug, title, description, isPrivate ? 1 : 0, id);
+  },
+  
+  delete: (id: number): void => {
+    db.prepare('DELETE FROM questionnaires WHERE id = ?').run(id);
+  },
+  
+  isSlugAvailable: (slug: string, excludeId?: number): boolean => {
+    if (excludeId) {
+      const result = db.prepare('SELECT id FROM questionnaires WHERE slug = ? AND id != ?').get(slug, excludeId);
+      return !result;
+    }
+    const result = db.prepare('SELECT id FROM questionnaires WHERE slug = ?').get(slug);
+    return !result;
+  },
+};
+
+// Participant operations
+export const participantOps = {
+  create: (questionnaireId: number, name: string, token: string): number => {
+    const result = db.prepare(
+      'INSERT INTO participants (questionnaire_id, name, token) VALUES (?, ?, ?)'
+    ).run(questionnaireId, name, token);
+    return result.lastInsertRowid as number;
+  },
+  
+  findByToken: (token: string): Participant | undefined => {
+    return db.prepare('SELECT * FROM participants WHERE token = ?').get(token) as Participant | undefined;
+  },
+  
+  findById: (id: number): Participant | undefined => {
+    return db.prepare('SELECT * FROM participants WHERE id = ?').get(id) as Participant | undefined;
+  },
+  
+  getByQuestionnaire: (questionnaireId: number): Participant[] => {
+    return db.prepare('SELECT * FROM participants WHERE questionnaire_id = ? ORDER BY created_at DESC').all(questionnaireId) as Participant[];
+  },
+  
+  delete: (id: number): void => {
+    db.prepare('DELETE FROM participants WHERE id = ?').run(id);
+  },
+  
+  isTokenAvailable: (token: string): boolean => {
+    const result = db.prepare('SELECT id FROM participants WHERE token = ?').get(token);
+    return !result;
+  },
+};
+
+// Activity operations
+export const activityOps = {
+  create: (questionnaireId: number, name: string, addedBy: string, description: string | null = null): number => {
+    const result = db.prepare(
+      'INSERT INTO activities (questionnaire_id, name, added_by, description) VALUES (?, ?, ?, ?)'
+    ).run(questionnaireId, name, addedBy, description);
+    return result.lastInsertRowid as number;
+  },
+  
+  findById: (id: number): Activity | undefined => {
+    return db.prepare('SELECT * FROM activities WHERE id = ?').get(id) as Activity | undefined;
+  },
+  
+  update: (id: number, name: string, description: string | null): void => {
+    db.prepare('UPDATE activities SET name = ?, description = ? WHERE id = ?').run(name, description, id);
+  },
+  
+  getByQuestionnaire: (questionnaireId: number): Activity[] => {
+    const activities = db.prepare(`
+      SELECT a.*,
+        COALESCE(SUM(CASE WHEN v.vote_type = 1 THEN 1 ELSE 0 END), 0) as upvotes,
+        COALESCE(SUM(CASE WHEN v.vote_type = -1 THEN 1 ELSE 0 END), 0) as downvotes,
+        COALESCE(SUM(v.vote_type), 0) as net_votes
+      FROM activities a
+      LEFT JOIN votes v ON a.id = v.activity_id
+      WHERE a.questionnaire_id = ?
+      GROUP BY a.id
+      ORDER BY net_votes DESC, a.created_at ASC
+    `).all(questionnaireId) as Activity[];
+    
+    // Add comment counts
+    activities.forEach(activity => {
+      activity.comment_count = commentOps.countByActivity(activity.id);
+    });
+    
+    return activities;
+  },
+  
+  delete: (id: number): void => {
+    db.prepare('DELETE FROM activities WHERE id = ?').run(id);
+  },
+};
+
+// Vote operations
+export const voteOps = {
+  upsert: (activityId: number, voterName: string, voteType: number): { action: string; voteType: number } => {
+    const existing = db.prepare(
+      'SELECT id, vote_type FROM votes WHERE activity_id = ? AND voter_name = ?'
+    ).get(activityId, voterName) as { id: number; vote_type: number } | undefined;
+    
+    if (existing) {
+      if (existing.vote_type === voteType) {
+        db.prepare('DELETE FROM votes WHERE id = ?').run(existing.id);
+        return { action: 'removed', voteType: 0 };
+      } else {
+        db.prepare('UPDATE votes SET vote_type = ? WHERE id = ?').run(voteType, existing.id);
+        return { action: 'changed', voteType };
+      }
+    } else {
+      db.prepare(
+        'INSERT INTO votes (activity_id, voter_name, vote_type) VALUES (?, ?, ?)'
+      ).run(activityId, voterName, voteType);
+      return { action: 'added', voteType };
+    }
+  },
+  
+  getByQuestionnaireAndVoter: (questionnaireId: number, voterName: string): { activity_id: number; vote_type: number }[] => {
+    return db.prepare(`
+      SELECT v.activity_id, v.vote_type
+      FROM votes v
+      JOIN activities a ON v.activity_id = a.id
+      WHERE a.questionnaire_id = ? AND v.voter_name = ?
+    `).all(questionnaireId, voterName) as { activity_id: number; vote_type: number }[];
+  },
+};
+
+// Comment operations
+export const commentOps = {
+  create: (activityId: number, authorName: string, content: string, parentId: number | null = null): number => {
+    const result = db.prepare(
+      'INSERT INTO comments (activity_id, author_name, content, parent_id) VALUES (?, ?, ?, ?)'
+    ).run(activityId, authorName, content, parentId);
+    return result.lastInsertRowid as number;
+  },
+  
+  getByActivity: (activityId: number): Comment[] => {
+    return db.prepare(`
+      SELECT * FROM comments 
+      WHERE activity_id = ? 
+      ORDER BY created_at ASC
+    `).all(activityId) as Comment[];
+  },
+  
+  getById: (id: number): Comment | undefined => {
+    return db.prepare('SELECT * FROM comments WHERE id = ?').get(id) as Comment | undefined;
+  },
+  
+  countByActivity: (activityId: number): number => {
+    const result = db.prepare('SELECT COUNT(*) as count FROM comments WHERE activity_id = ?').get(activityId) as { count: number };
+    return result.count;
+  },
+  
+  delete: (id: number): void => {
+    db.prepare('DELETE FROM comments WHERE id = ?').run(id);
+  },
+};
+
--- a/server/index.ts
+++ b/server/index.ts
@@ -0,0 +1,75 @@
+import express from 'express';
+import session from 'express-session';
+import cookieParser from 'cookie-parser';
+import cors from 'cors';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+import { initializeDatabase } from './database.js';
+import authRoutes from './routes/auth.js';
+import adminRoutes from './routes/admin.js';
+import questionnaireRoutes from './routes/questionnaire.js';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+// Initialize database
+initializeDatabase();
+
+const app = express();
+const PORT = process.env.PORT || 4000;
+const isProduction = process.env.NODE_ENV === 'production';
+
+// Middleware
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+app.use(cookieParser());
+
+// CORS for development
+if (!isProduction) {
+  app.use(cors({
+    origin: 'http://localhost:5173',
+    credentials: true,
+  }));
+}
+
+// Session configuration
+declare module 'express-session' {
+  interface SessionData {
+    user?: { id: number; username: string };
+    returnTo?: string;
+  }
+}
+
+app.use(session({
+  secret: process.env.SESSION_SECRET || 'dev-secret-change-in-production',
+  resave: false,
+  saveUninitialized: false,
+  cookie: {
+    secure: isProduction && process.env.HTTPS === 'true',
+    httpOnly: true,
+    maxAge: 24 * 60 * 60 * 1000, // 24 hours
+    sameSite: isProduction ? 'strict' : 'lax',
+  },
+}));
+
+// API Routes
+app.use('/api/auth', authRoutes);
+app.use('/api/admin', adminRoutes);
+app.use('/api/q', questionnaireRoutes);
+
+// Serve static files in production
+if (isProduction) {
+  const clientPath = path.join(__dirname, '../client');
+  app.use(express.static(clientPath));
+  
+  // SPA fallback
+  app.get('*', (req, res) => {
+    res.sendFile(path.join(clientPath, 'index.html'));
+  });
+}
+
+app.listen(PORT, () => {
+  console.log(`Server running on http://localhost:${PORT}`);
+});
+
--- a/server/middleware/auth.ts
+++ b/server/middleware/auth.ts
@@ -0,0 +1,10 @@
+import { Request, Response, NextFunction } from 'express';
+
+export function requireAuth(req: Request, res: Response, next: NextFunction): void {
+  if (req.session && req.session.user) {
+    next();
+  } else {
+    res.status(401).json({ error: 'Authenticatie vereist' });
+  }
+}
+
--- a/server/routes/admin.ts
+++ b/server/routes/admin.ts
@@ -0,0 +1,283 @@
+import { Router, Request, Response } from 'express';
+import { v4 as uuidv4 } from 'uuid';
+import crypto from 'crypto';
+import { userOps, questionnaireOps, activityOps, participantOps } from '../database.js';
+import { requireAuth } from '../middleware/auth.js';
+
+const router = Router();
+
+// Apply auth middleware to all admin routes
+router.use(requireAuth);
+
+// Get all questionnaires
+router.get('/questionnaires', (req: Request, res: Response) => {
+  const questionnaires = questionnaireOps.getAll();
+  res.json(questionnaires);
+});
+
+// Validate slug format
+function isValidSlug(slug: string): boolean {
+  return /^[a-z0-9]+(?:-[a-z0-9]+)*$/.test(slug);
+}
+
+// Create questionnaire
+router.post('/questionnaires', (req: Request, res: Response) => {
+  const { title, description, slug, isPrivate } = req.body;
+  
+  if (!title?.trim()) {
+    res.status(400).json({ error: 'Titel is verplicht' });
+    return;
+  }
+  
+  if (!slug?.trim()) {
+    res.status(400).json({ error: 'Slug is verplicht' });
+    return;
+  }
+  
+  const cleanSlug = slug.trim().toLowerCase();
+  
+  if (!isValidSlug(cleanSlug)) {
+    res.status(400).json({ error: 'Slug mag alleen kleine letters, cijfers en koppeltekens bevatten' });
+    return;
+  }
+  
+  if (cleanSlug.length < 3 || cleanSlug.length > 50) {
+    res.status(400).json({ error: 'Slug moet tussen 3 en 50 tekens zijn' });
+    return;
+  }
+  
+  if (!questionnaireOps.isSlugAvailable(cleanSlug)) {
+    res.status(400).json({ error: 'Deze slug is al in gebruik' });
+    return;
+  }
+  
+  const uuid = uuidv4();
+  const id = questionnaireOps.create(uuid, cleanSlug, title.trim(), description?.trim() || null, !!isPrivate, req.session.user!.id);
+  const questionnaire = questionnaireOps.findById(id);
+  
+  res.json({ success: true, questionnaire });
+});
+
+// Get questionnaire by ID
+router.get('/questionnaires/:id', (req: Request, res: Response) => {
+  const questionnaire = questionnaireOps.findById(parseInt(req.params.id));
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const activities = activityOps.getByQuestionnaire(questionnaire.id);
+  res.json({ questionnaire, activities });
+});
+
+// Update questionnaire
+router.put('/questionnaires/:id', (req: Request, res: Response) => {
+  const { title, description, slug, isPrivate } = req.body;
+  const questionnaire = questionnaireOps.findById(parseInt(req.params.id));
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  if (!title?.trim()) {
+    res.status(400).json({ error: 'Titel is verplicht' });
+    return;
+  }
+  
+  if (!slug?.trim()) {
+    res.status(400).json({ error: 'Slug is verplicht' });
+    return;
+  }
+  
+  const cleanSlug = slug.trim().toLowerCase();
+  
+  if (!isValidSlug(cleanSlug)) {
+    res.status(400).json({ error: 'Slug mag alleen kleine letters, cijfers en koppeltekens bevatten' });
+    return;
+  }
+  
+  if (cleanSlug.length < 3 || cleanSlug.length > 50) {
+    res.status(400).json({ error: 'Slug moet tussen 3 en 50 tekens zijn' });
+    return;
+  }
+  
+  if (!questionnaireOps.isSlugAvailable(cleanSlug, questionnaire.id)) {
+    res.status(400).json({ error: 'Deze slug is al in gebruik' });
+    return;
+  }
+  
+  questionnaireOps.update(questionnaire.id, cleanSlug, title.trim(), description?.trim() || null, !!isPrivate);
+  res.json({ success: true });
+});
+
+// Check slug availability
+router.get('/questionnaires/check-slug/:slug', (req: Request, res: Response) => {
+  const { slug } = req.params;
+  const { excludeId } = req.query;
+  
+  const cleanSlug = slug.trim().toLowerCase();
+  const available = questionnaireOps.isSlugAvailable(cleanSlug, excludeId ? parseInt(excludeId as string) : undefined);
+  
+  res.json({ available });
+});
+
+// Get participants for a questionnaire
+router.get('/questionnaires/:id/participants', (req: Request, res: Response) => {
+  const questionnaire = questionnaireOps.findById(parseInt(req.params.id));
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const participants = participantOps.getByQuestionnaire(questionnaire.id);
+  res.json(participants);
+});
+
+// Generate unique token
+function generateToken(): string {
+  return crypto.randomBytes(16).toString('hex');
+}
+
+// Add participant to questionnaire
+router.post('/questionnaires/:id/participants', (req: Request, res: Response) => {
+  const { name } = req.body;
+  const questionnaire = questionnaireOps.findById(parseInt(req.params.id));
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  if (!name?.trim()) {
+    res.status(400).json({ error: 'Naam is verplicht' });
+    return;
+  }
+  
+  // Generate unique token
+  let token = generateToken();
+  while (!participantOps.isTokenAvailable(token)) {
+    token = generateToken();
+  }
+  
+  const id = participantOps.create(questionnaire.id, name.trim(), token);
+  const participant = participantOps.findById(id);
+  
+  res.json({ success: true, participant });
+});
+
+// Delete participant
+router.delete('/participants/:id', (req: Request, res: Response) => {
+  participantOps.delete(parseInt(req.params.id));
+  res.json({ success: true });
+});
+
+// Delete questionnaire
+router.delete('/questionnaires/:id', (req: Request, res: Response) => {
+  questionnaireOps.delete(parseInt(req.params.id));
+  res.json({ success: true });
+});
+
+// Update activity
+router.put('/activities/:id', (req: Request, res: Response) => {
+  const { name, description } = req.body;
+  const activity = activityOps.findById(parseInt(req.params.id));
+  
+  if (!activity) {
+    res.status(404).json({ error: 'Activiteit niet gevonden' });
+    return;
+  }
+  
+  if (!name?.trim()) {
+    res.status(400).json({ error: 'Naam activiteit is verplicht' });
+    return;
+  }
+  
+  activityOps.update(activity.id, name.trim(), description?.trim() || null);
+  const updatedActivity = activityOps.findById(activity.id);
+  res.json({ success: true, activity: updatedActivity });
+});
+
+// Delete activity
+router.delete('/activities/:id', (req: Request, res: Response) => {
+  activityOps.delete(parseInt(req.params.id));
+  res.json({ success: true });
+});
+
+// Get all users
+router.get('/users', (req: Request, res: Response) => {
+  const users = userOps.getAll();
+  res.json(users);
+});
+
+// Create user
+router.post('/users', (req: Request, res: Response) => {
+  const { username, password } = req.body;
+  
+  if (!username || !password) {
+    res.status(400).json({ error: 'Gebruikersnaam en wachtwoord zijn verplicht' });
+    return;
+  }
+  
+  if (password.length < 6) {
+    res.status(400).json({ error: 'Wachtwoord moet minimaal 6 tekens zijn' });
+    return;
+  }
+  
+  const existingUser = userOps.findByUsername(username);
+  if (existingUser) {
+    res.status(400).json({ error: 'Gebruikersnaam bestaat al' });
+    return;
+  }
+  
+  const id = userOps.create(username, password);
+  const user = userOps.findById(id);
+  res.json({ success: true, user });
+});
+
+// Delete user
+router.delete('/users/:id', (req: Request, res: Response) => {
+  const userId = parseInt(req.params.id);
+  
+  if (userId === req.session.user!.id) {
+    res.status(400).json({ error: 'Je kunt jezelf niet verwijderen' });
+    return;
+  }
+  
+  if (userOps.count() <= 1) {
+    res.status(400).json({ error: 'Je kunt de laatste beheerder niet verwijderen' });
+    return;
+  }
+  
+  userOps.delete(userId);
+  res.json({ success: true });
+});
+
+// Change password
+router.post('/change-password', (req: Request, res: Response) => {
+  const { currentPassword, newPassword } = req.body;
+  
+  const user = userOps.findByUsername(req.session.user!.username);
+  if (!user) {
+    res.status(404).json({ error: 'Gebruiker niet gevonden' });
+    return;
+  }
+  
+  if (!userOps.verifyPassword(user, currentPassword)) {
+    res.status(400).json({ error: 'Huidig wachtwoord is onjuist' });
+    return;
+  }
+  
+  if (newPassword.length < 6) {
+    res.status(400).json({ error: 'Wachtwoord moet minimaal 6 tekens zijn' });
+    return;
+  }
+  
+  userOps.updatePassword(req.session.user!.id, newPassword);
+  res.json({ success: true });
+});
+
+export default router;
+
--- a/server/routes/auth.ts
+++ b/server/routes/auth.ts
@@ -0,0 +1,50 @@
+import { Router, Request, Response } from 'express';
+import { userOps } from '../database.js';
+
+const router = Router();
+
+// Check auth status
+router.get('/status', (req: Request, res: Response) => {
+  if (req.session.user) {
+    res.json({ authenticated: true, user: req.session.user });
+  } else {
+    res.json({ authenticated: false });
+  }
+});
+
+// Login
+router.post('/login', (req: Request, res: Response) => {
+  const { username, password } = req.body;
+  
+  if (!username || !password) {
+    res.status(400).json({ error: 'Gebruikersnaam en wachtwoord zijn verplicht' });
+    return;
+  }
+  
+  const user = userOps.findByUsername(username);
+  
+  if (!user || !userOps.verifyPassword(user, password)) {
+    res.status(401).json({ error: 'Ongeldige gebruikersnaam of wachtwoord' });
+    return;
+  }
+  
+  req.session.user = {
+    id: user.id,
+    username: user.username,
+  };
+  
+  res.json({ success: true, user: req.session.user });
+});
+
+// Logout
+router.post('/logout', (req: Request, res: Response) => {
+  req.session.destroy((err) => {
+    if (err) {
+      console.error('Session destroy error:', err);
+    }
+    res.json({ success: true });
+  });
+});
+
+export default router;
+
--- a/server/routes/questionnaire.ts
+++ b/server/routes/questionnaire.ts
@@ -0,0 +1,366 @@
+import { Router, Request, Response } from 'express';
+import { questionnaireOps, activityOps, voteOps, commentOps, participantOps, Comment, Questionnaire } from '../database.js';
+
+// Helper to check if user can participate (write access)
+function canParticipate(questionnaire: Questionnaire, req: Request): { canWrite: boolean; participantName: string | null } {
+  // Check for participant token first
+  const token = req.cookies.participantToken;
+  if (token) {
+    const participant = participantOps.findByToken(token);
+    if (participant && participant.questionnaire_id === questionnaire.id) {
+      return { canWrite: true, participantName: participant.name };
+    }
+  }
+  
+  // For public questionnaires, use visitor name
+  if (!questionnaire.is_private) {
+    const visitorName = req.cookies.visitorName;
+    return { canWrite: !!visitorName, participantName: visitorName || null };
+  }
+  
+  // Private questionnaire without valid token
+  return { canWrite: false, participantName: null };
+}
+
+const router = Router();
+
+// Access questionnaire via participant token
+router.get('/token/:token', (req: Request, res: Response) => {
+  const participant = participantOps.findByToken(req.params.token);
+  
+  if (!participant) {
+    res.status(404).json({ error: 'Ongeldige toegangslink' });
+    return;
+  }
+  
+  const questionnaire = questionnaireOps.findById(participant.questionnaire_id);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  // Set participant token cookie
+  res.cookie('participantToken', participant.token, {
+    maxAge: 30 * 24 * 60 * 60 * 1000, // 30 days
+    httpOnly: true,
+    sameSite: 'lax',
+  });
+  
+  const activities = activityOps.getByQuestionnaire(questionnaire.id);
+  
+  let userVotes: Record<number, number> = {};
+  const votes = voteOps.getByQuestionnaireAndVoter(questionnaire.id, participant.name);
+  votes.forEach(v => {
+    userVotes[v.activity_id] = v.vote_type;
+  });
+  
+  res.json({ 
+    questionnaire, 
+    activities, 
+    visitorName: participant.name, 
+    userVotes,
+    isParticipant: true,
+    canWrite: true,
+  });
+});
+
+// Get questionnaire by slug (public - may be read-only for private questionnaires)
+router.get('/:slug', (req: Request, res: Response) => {
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const activities = activityOps.getByQuestionnaire(questionnaire.id);
+  const { canWrite, participantName } = canParticipate(questionnaire, req);
+  
+  let userVotes: Record<number, number> = {};
+  if (participantName) {
+    const votes = voteOps.getByQuestionnaireAndVoter(questionnaire.id, participantName);
+    votes.forEach(v => {
+      userVotes[v.activity_id] = v.vote_type;
+    });
+  }
+  
+  res.json({ 
+    questionnaire, 
+    activities, 
+    visitorName: participantName || '',
+    userVotes,
+    isPrivate: !!questionnaire.is_private,
+    canWrite,
+  });
+});
+
+// Set visitor name (only for public questionnaires)
+router.post('/:slug/set-name', (req: Request, res: Response) => {
+  const { name } = req.body;
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  if (questionnaire.is_private) {
+    res.status(403).json({ error: 'Voor deze vragenlijst is een uitnodigingslink nodig' });
+    return;
+  }
+  
+  if (!name?.trim()) {
+    res.status(400).json({ error: 'Naam is verplicht' });
+    return;
+  }
+  
+  res.cookie('visitorName', name.trim(), {
+    maxAge: 30 * 24 * 60 * 60 * 1000, // 30 days
+    httpOnly: true,
+    sameSite: 'lax',
+  });
+  
+  res.json({ success: true, name: name.trim() });
+});
+
+// Clear visitor name
+router.post('/:slug/clear-name', (req: Request, res: Response) => {
+  res.clearCookie('visitorName');
+  res.clearCookie('participantToken');
+  res.json({ success: true });
+});
+
+// Add activity
+router.post('/:slug/activities', (req: Request, res: Response) => {
+  const { name, description } = req.body;
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const { canWrite, participantName } = canParticipate(questionnaire, req);
+  
+  if (!canWrite || !participantName) {
+    if (questionnaire.is_private) {
+      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om deel te nemen' });
+    } else {
+      res.status(401).json({ error: 'Voer eerst je naam in' });
+    }
+    return;
+  }
+  
+  if (!name?.trim()) {
+    res.status(400).json({ error: 'Naam activiteit is verplicht' });
+    return;
+  }
+  
+  const activityDescription = description?.trim() || null;
+  const activityId = activityOps.create(questionnaire.id, name.trim(), participantName, activityDescription);
+  const activities = activityOps.getByQuestionnaire(questionnaire.id);
+  const activity = activities.find(a => a.id === activityId);
+  
+  res.json({ success: true, activity });
+});
+
+// Update activity (only by the user who added it)
+router.put('/:slug/activities/:activityId', (req: Request, res: Response) => {
+  const { name, description } = req.body;
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const { canWrite, participantName } = canParticipate(questionnaire, req);
+  
+  if (!canWrite || !participantName) {
+    if (questionnaire.is_private) {
+      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om te bewerken' });
+    } else {
+      res.status(401).json({ error: 'Voer eerst je naam in' });
+    }
+    return;
+  }
+  
+  const activity = activityOps.findById(parseInt(req.params.activityId));
+  if (!activity || activity.questionnaire_id !== questionnaire.id) {
+    res.status(404).json({ error: 'Activiteit niet gevonden' });
+    return;
+  }
+  
+  // Check if the user is the one who added the activity
+  if (activity.added_by !== participantName) {
+    res.status(403).json({ error: 'Je kunt alleen je eigen activiteiten bewerken' });
+    return;
+  }
+  
+  if (!name?.trim()) {
+    res.status(400).json({ error: 'Naam activiteit is verplicht' });
+    return;
+  }
+  
+  activityOps.update(activity.id, name.trim(), description?.trim() || null);
+  const activities = activityOps.getByQuestionnaire(questionnaire.id);
+  const updatedActivity = activities.find(a => a.id === activity.id);
+  
+  res.json({ success: true, activity: updatedActivity });
+});
+
+// Vote on activity
+router.post('/:slug/activities/:activityId/vote', (req: Request, res: Response) => {
+  const { voteType } = req.body;
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const { canWrite, participantName } = canParticipate(questionnaire, req);
+  
+  if (!canWrite || !participantName) {
+    if (questionnaire.is_private) {
+      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om te stemmen' });
+    } else {
+      res.status(401).json({ error: 'Voer eerst je naam in' });
+    }
+    return;
+  }
+  
+  const activity = activityOps.findById(parseInt(req.params.activityId));
+  if (!activity || activity.questionnaire_id !== questionnaire.id) {
+    res.status(404).json({ error: 'Activiteit niet gevonden' });
+    return;
+  }
+  
+  if (voteType !== 1 && voteType !== -1) {
+    res.status(400).json({ error: 'Ongeldig stemtype' });
+    return;
+  }
+  
+  const result = voteOps.upsert(activity.id, participantName, voteType);
+  const activities = activityOps.getByQuestionnaire(questionnaire.id);
+  const updatedActivity = activities.find(a => a.id === activity.id);
+  
+  res.json({
+    success: true,
+    action: result.action,
+    currentVote: result.voteType,
+    activity: updatedActivity,
+  });
+});
+
+// Get activities
+router.get('/:slug/activities', (req: Request, res: Response) => {
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const activities = activityOps.getByQuestionnaire(questionnaire.id);
+  const visitorName = req.cookies.visitorName || '';
+  
+  let userVotes: Record<number, number> = {};
+  if (visitorName) {
+    const votes = voteOps.getByQuestionnaireAndVoter(questionnaire.id, visitorName);
+    votes.forEach(v => {
+      userVotes[v.activity_id] = v.vote_type;
+    });
+  }
+  
+  res.json({ activities, userVotes });
+});
+
+// Get comments for an activity
+router.get('/:slug/activities/:activityId/comments', (req: Request, res: Response) => {
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const activity = activityOps.findById(parseInt(req.params.activityId));
+  if (!activity || activity.questionnaire_id !== questionnaire.id) {
+    res.status(404).json({ error: 'Activiteit niet gevonden' });
+    return;
+  }
+  
+  const comments = commentOps.getByActivity(activity.id);
+  
+  // Build nested comment tree
+  const commentMap: Record<number, Comment> = {};
+  const rootComments: Comment[] = [];
+  
+  comments.forEach(comment => {
+    comment.replies = [];
+    commentMap[comment.id] = comment;
+  });
+  
+  comments.forEach(comment => {
+    if (comment.parent_id) {
+      if (commentMap[comment.parent_id]) {
+        commentMap[comment.parent_id].replies!.push(comment);
+      }
+    } else {
+      rootComments.push(comment);
+    }
+  });
+  
+  res.json({ comments: rootComments, activity });
+});
+
+// Add a comment
+router.post('/:slug/activities/:activityId/comments', (req: Request, res: Response) => {
+  const { content, parentId } = req.body;
+  const questionnaire = questionnaireOps.findBySlug(req.params.slug);
+  
+  if (!questionnaire) {
+    res.status(404).json({ error: 'Vragenlijst niet gevonden' });
+    return;
+  }
+  
+  const { canWrite, participantName } = canParticipate(questionnaire, req);
+  
+  if (!canWrite || !participantName) {
+    if (questionnaire.is_private) {
+      res.status(403).json({ error: 'Je hebt een uitnodigingslink nodig om te reageren' });
+    } else {
+      res.status(401).json({ error: 'Voer eerst je naam in' });
+    }
+    return;
+  }
+  
+  const activity = activityOps.findById(parseInt(req.params.activityId));
+  if (!activity || activity.questionnaire_id !== questionnaire.id) {
+    res.status(404).json({ error: 'Activiteit niet gevonden' });
+    return;
+  }
+  
+  if (!content?.trim()) {
+    res.status(400).json({ error: 'Reactie inhoud is verplicht' });
+    return;
+  }
+  
+  if (parentId) {
+    const parentComment = commentOps.getById(parentId);
+    if (!parentComment || parentComment.activity_id !== activity.id) {
+      res.status(400).json({ error: 'Ongeldige reactie om op te reageren' });
+      return;
+    }
+  }
+  
+  const commentId = commentOps.create(activity.id, participantName, content.trim(), parentId || null);
+  const comment = commentOps.getById(commentId);
+  
+  res.json({ success: true, comment: { ...comment, replies: [] } });
+});
+
+export default router;
+
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -0,0 +1,45 @@
+import { Routes, Route, Navigate } from 'react-router-dom'
+import { AuthProvider } from './context/AuthContext'
+import { ProtectedRoute } from './components/ProtectedRoute'
+import { AdminLayout } from './components/AdminLayout'
+import { Login } from './pages/Login'
+import { Dashboard } from './pages/Dashboard'
+import { QuestionnaireForm } from './pages/QuestionnaireForm'
+import { QuestionnaireDetail } from './pages/QuestionnaireDetail'
+import { Users } from './pages/Users'
+import { ChangePassword } from './pages/ChangePassword'
+import { PublicQuestionnaire } from './pages/PublicQuestionnaire'
+import { NotFound } from './pages/NotFound'
+
+function App() {
+  return (
+    <AuthProvider>
+      <Routes>
+        {/* Public routes */}
+        <Route path="/login" element={<Login />} />
+        <Route path="/q/:slug" element={<PublicQuestionnaire />} />
+        <Route path="/q/access/:token" element={<PublicQuestionnaire />} />
+        
+        {/* Protected admin routes */}
+        <Route path="/admin" element={<ProtectedRoute><AdminLayout /></ProtectedRoute>}>
+          <Route index element={<Navigate to="/admin/dashboard" replace />} />
+          <Route path="dashboard" element={<Dashboard />} />
+          <Route path="questionnaires/new" element={<QuestionnaireForm />} />
+          <Route path="questionnaires/:id" element={<QuestionnaireDetail />} />
+          <Route path="questionnaires/:id/edit" element={<QuestionnaireForm />} />
+          <Route path="users" element={<Users />} />
+          <Route path="change-password" element={<ChangePassword />} />
+        </Route>
+        
+        {/* Redirect root to login */}
+        <Route path="/" element={<Navigate to="/login" replace />} />
+        
+        {/* 404 */}
+        <Route path="*" element={<NotFound />} />
+      </Routes>
+    </AuthProvider>
+  )
+}
+
+export default App
+
--- a/src/components/AdminLayout.tsx
+++ b/src/components/AdminLayout.tsx
@@ -0,0 +1,62 @@
+import { Link, Outlet, useNavigate } from 'react-router-dom'
+import { useAuth } from '../context/AuthContext'
+
+export function AdminLayout() {
+  const { user, logout } = useAuth()
+  const navigate = useNavigate()
+
+  async function handleLogout() {
+    await logout()
+    navigate('/login')
+  }
+
+  return (
+    <div className="min-h-screen flex flex-col">
+      <nav className="bg-bg-elevated border-b border-border sticky top-0 z-50 backdrop-blur-md">
+        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
+          <div className="flex justify-between h-14 items-center">
+            <Link to="/admin/dashboard" className="text-lg font-bold text-text hover:text-accent transition-colors">
+              Activiteiten Inventaris
+            </Link>
+            
+            <div className="flex items-center gap-2">
+              <Link 
+                to="/admin/dashboard" 
+                className="px-3 py-1.5 text-sm text-text-muted hover:text-text hover:bg-bg-card rounded-md transition-colors"
+              >
+                Dashboard
+              </Link>
+              <Link 
+                to="/admin/users" 
+                className="px-3 py-1.5 text-sm text-text-muted hover:text-text hover:bg-bg-card rounded-md transition-colors"
+              >
+                Gebruikers
+              </Link>
+              <Link 
+                to="/admin/change-password" 
+                className="px-3 py-1.5 text-sm text-text-muted hover:text-text hover:bg-bg-card rounded-md transition-colors"
+              >
+                Wachtwoord
+              </Link>
+              <button 
+                onClick={handleLogout}
+                className="px-3 py-1.5 text-sm text-danger hover:bg-danger-muted rounded-md transition-colors"
+              >
+                Uitloggen
+              </button>
+            </div>
+          </div>
+        </div>
+      </nav>
+      
+      <main className="flex-1 max-w-7xl mx-auto w-full px-4 sm:px-6 lg:px-8 py-8">
+        <Outlet />
+      </main>
+      
+      <footer className="border-t border-border-light py-6 text-center text-text-faint text-sm">
+        Activiteiten Inventaris Systeem
+      </footer>
+    </div>
+  )
+}
+
--- a/src/components/ProtectedRoute.tsx
+++ b/src/components/ProtectedRoute.tsx
@@ -0,0 +1,22 @@
+import { Navigate } from 'react-router-dom'
+import { useAuth } from '../context/AuthContext'
+import { ReactNode } from 'react'
+
+export function ProtectedRoute({ children }: { children: ReactNode }) {
+  const { user, loading } = useAuth()
+
+  if (loading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-bg">
+        <div className="text-text-muted">Loading...</div>
+      </div>
+    )
+  }
+
+  if (!user) {
+    return <Navigate to="/login" replace />
+  }
+
+  return <>{children}</>
+}
+
--- a/src/context/AuthContext.tsx
+++ b/src/context/AuthContext.tsx
@@ -0,0 +1,78 @@
+import { createContext, useContext, useState, useEffect, ReactNode } from 'react'
+
+interface User {
+  id: number
+  username: string
+}
+
+interface AuthContextType {
+  user: User | null
+  loading: boolean
+  login: (username: string, password: string) => Promise<void>
+  logout: () => Promise<void>
+}
+
+const AuthContext = createContext<AuthContextType | null>(null)
+
+export function AuthProvider({ children }: { children: ReactNode }) {
+  const [user, setUser] = useState<User | null>(null)
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    checkAuth()
+  }, [])
+
+  async function checkAuth() {
+    try {
+      const res = await fetch('/api/auth/status', { credentials: 'include' })
+      const data = await res.json()
+      if (data.authenticated) {
+        setUser(data.user)
+      }
+    } catch (error) {
+      console.error('Auth check failed:', error)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  async function login(username: string, password: string) {
+    const res = await fetch('/api/auth/login', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      credentials: 'include',
+      body: JSON.stringify({ username, password }),
+    })
+    
+    const data = await res.json()
+    
+    if (!res.ok) {
+      throw new Error(data.error || 'Inloggen mislukt')
+    }
+    
+    setUser(data.user)
+  }
+
+  async function logout() {
+    await fetch('/api/auth/logout', {
+      method: 'POST',
+      credentials: 'include',
+    })
+    setUser(null)
+  }
+
+  return (
+    <AuthContext.Provider value={{ user, loading, login, logout }}>
+      {children}
+    </AuthContext.Provider>
+  )
+}
+
+export function useAuth() {
+  const context = useContext(AuthContext)
+  if (!context) {
+    throw new Error('useAuth must be used within an AuthProvider')
+  }
+  return context
+}
+
--- a/src/index.css
+++ b/src/index.css
@@ -0,0 +1,26 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+body {
+  @apply bg-bg text-text font-sans antialiased min-h-screen;
+}
+
+/* Custom scrollbar */
+::-webkit-scrollbar {
+  width: 8px;
+  height: 8px;
+}
+
+::-webkit-scrollbar-track {
+  @apply bg-bg-elevated;
+}
+
+::-webkit-scrollbar-thumb {
+  @apply bg-border rounded;
+}
+
+::-webkit-scrollbar-thumb:hover {
+  @apply bg-text-faint;
+}
+
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -0,0 +1,14 @@
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import { BrowserRouter } from 'react-router-dom'
+import App from './App'
+import './index.css'
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <BrowserRouter>
+      <App />
+    </BrowserRouter>
+  </React.StrictMode>,
+)
+
--- a/src/pages/ChangePassword.tsx
+++ b/src/pages/ChangePassword.tsx
@@ -0,0 +1,125 @@
+import { useState, FormEvent } from 'react'
+import { Link, useNavigate } from 'react-router-dom'
+
+export function ChangePassword() {
+  const navigate = useNavigate()
+  const [currentPassword, setCurrentPassword] = useState('')
+  const [newPassword, setNewPassword] = useState('')
+  const [confirmPassword, setConfirmPassword] = useState('')
+  const [error, setError] = useState('')
+  const [loading, setLoading] = useState(false)
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault()
+    setError('')
+
+    if (newPassword !== confirmPassword) {
+      setError('Nieuwe wachtwoorden komen niet overeen')
+      return
+    }
+
+    setLoading(true)
+
+    try {
+      const res = await fetch('/api/admin/change-password', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ currentPassword, newPassword }),
+      })
+
+      const data = await res.json()
+
+      if (!res.ok) {
+        throw new Error(data.error || 'Wachtwoord wijzigen mislukt')
+      }
+
+      navigate('/admin/dashboard')
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Wachtwoord wijzigen mislukt')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className="max-w-md">
+      <Link to="/admin/dashboard" className="inline-block text-text-muted hover:text-accent text-sm mb-4 transition-colors">
+        ← Terug naar Dashboard
+      </Link>
+
+      <h1 className="text-2xl font-bold text-text mb-8">Wachtwoord Wijzigen</h1>
+
+      <div className="bg-bg-card border border-border rounded-xl p-6">
+        {error && (
+          <div className="mb-6 p-4 bg-danger-muted border border-danger/30 rounded-lg text-danger text-sm">
+            {error}
+          </div>
+        )}
+
+        <form onSubmit={handleSubmit} className="space-y-6">
+          <div>
+            <label htmlFor="currentPassword" className="block text-sm font-medium text-text mb-2">
+              Huidig Wachtwoord
+            </label>
+            <input
+              type="password"
+              id="currentPassword"
+              value={currentPassword}
+              onChange={(e) => setCurrentPassword(e.target.value)}
+              className="w-full px-4 py-3 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+              required
+            />
+          </div>
+
+          <div>
+            <label htmlFor="newPassword" className="block text-sm font-medium text-text mb-2">
+              Nieuw Wachtwoord
+            </label>
+            <input
+              type="password"
+              id="newPassword"
+              value={newPassword}
+              onChange={(e) => setNewPassword(e.target.value)}
+              className="w-full px-4 py-3 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+              placeholder="Min. 6 tekens"
+              minLength={6}
+              required
+            />
+          </div>
+
+          <div>
+            <label htmlFor="confirmPassword" className="block text-sm font-medium text-text mb-2">
+              Bevestig Nieuw Wachtwoord
+            </label>
+            <input
+              type="password"
+              id="confirmPassword"
+              value={confirmPassword}
+              onChange={(e) => setConfirmPassword(e.target.value)}
+              className="w-full px-4 py-3 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+              required
+            />
+          </div>
+
+          <div className="flex gap-3 justify-end pt-4">
+            <Link
+              to="/admin/dashboard"
+              className="px-4 py-2 border border-border rounded-lg text-text-muted hover:text-text hover:border-text-muted transition-colors"
+            >
+              Annuleren
+            </Link>
+            <button
+              type="submit"
+              disabled={loading}
+              className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              {loading ? 'Bijwerken...' : 'Wachtwoord Bijwerken'}
+            </button>
+          </div>
+        </form>
+      </div>
+    </div>
+  )
+}
+
--- a/src/pages/Dashboard.tsx
+++ b/src/pages/Dashboard.tsx
@@ -0,0 +1,126 @@
+import { useState, useEffect } from 'react'
+import { Link } from 'react-router-dom'
+
+interface Questionnaire {
+  id: number
+  uuid: string
+  slug: string
+  title: string
+  description: string | null
+  is_private: boolean
+  creator_name: string
+  created_at: string
+  activity_count: number
+}
+
+export function Dashboard() {
+  const [questionnaires, setQuestionnaires] = useState<Questionnaire[]>([])
+  const [loading, setLoading] = useState(true)
+
+  useEffect(() => {
+    fetchQuestionnaires()
+  }, [])
+
+  async function fetchQuestionnaires() {
+    try {
+      const res = await fetch('/api/admin/questionnaires', { credentials: 'include' })
+      const data = await res.json()
+      setQuestionnaires(data)
+    } catch (error) {
+      console.error('Failed to fetch questionnaires:', error)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  function formatDate(dateStr: string) {
+    return new Date(dateStr).toLocaleDateString('nl-NL', {
+      year: 'numeric',
+      month: 'short',
+      day: 'numeric',
+    })
+  }
+
+  if (loading) {
+    return <div className="text-text-muted">Laden...</div>
+  }
+
+  return (
+    <div>
+      <div className="flex justify-between items-center mb-8">
+        <h1 className="text-2xl font-bold text-text">Vragenlijsten</h1>
+        <Link
+          to="/admin/questionnaires/new"
+          className="inline-flex items-center gap-2 px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-all hover:-translate-y-0.5 hover:shadow-lg"
+        >
+          <span className="text-xl leading-none">+</span>
+          Nieuwe Vragenlijst
+        </Link>
+      </div>
+
+      {questionnaires.length > 0 ? (
+        <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
+          {questionnaires.map((q) => (
+            <div
+              key={q.id}
+              className="bg-bg-card border border-border rounded-xl p-5 hover:border-accent transition-all hover:-translate-y-0.5 hover:shadow-lg"
+            >
+              <div className="flex justify-between items-start gap-3 mb-3">
+                <h2 className="font-semibold text-text line-clamp-2">{q.title}</h2>
+                <div className="flex gap-1.5 shrink-0">
+                  {q.is_private && (
+                    <span className="px-2 py-0.5 bg-accent/20 text-accent text-xs font-semibold rounded">Privé</span>
+                  )}
+                  <span className="px-2 py-0.5 bg-bg-input rounded text-xs font-semibold text-text-muted">
+                    {q.activity_count} activiteiten
+                  </span>
+                </div>
+              </div>
+
+              <div className="mb-3">
+                <span className="text-xs font-mono text-accent bg-accent/10 px-2 py-0.5 rounded">/q/{q.slug}</span>
+              </div>
+
+              {q.description && (
+                <p className="text-sm text-text-muted mb-3 line-clamp-2">{q.description}</p>
+              )}
+
+              <div className="flex gap-4 text-xs text-text-faint mb-4">
+                <span>door {q.creator_name}</span>
+                <span>{formatDate(q.created_at)}</span>
+              </div>
+
+              <div className="flex gap-2">
+                <Link
+                  to={`/admin/questionnaires/${q.id}`}
+                  className="px-3 py-1.5 bg-bg-input border border-border rounded-md text-sm font-medium text-text hover:bg-bg-elevated transition-colors"
+                >
+                  Bekijken
+                </Link>
+                <Link
+                  to={`/admin/questionnaires/${q.id}/edit`}
+                  className="px-3 py-1.5 border border-border rounded-md text-sm font-medium text-text-muted hover:text-text hover:border-text-muted transition-colors"
+                >
+                  Bewerken
+                </Link>
+              </div>
+            </div>
+          ))}
+        </div>
+      ) : (
+        <div className="text-center py-16 bg-bg-card border border-dashed border-border rounded-xl">
+          <div className="text-4xl mb-4 opacity-50">📋</div>
+          <h2 className="text-lg font-semibold text-text mb-2">Nog geen vragenlijsten</h2>
+          <p className="text-text-muted mb-6">Maak je eerste vragenlijst om activiteiten en stemmen te verzamelen.</p>
+          <Link
+            to="/admin/questionnaires/new"
+            className="inline-flex items-center gap-2 px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors"
+          >
+            Vragenlijst Maken
+          </Link>
+        </div>
+      )}
+    </div>
+  )
+}
+
--- a/src/pages/Login.tsx
+++ b/src/pages/Login.tsx
@@ -0,0 +1,94 @@
+import { useState, FormEvent } from 'react'
+import { useNavigate } from 'react-router-dom'
+import { useAuth } from '../context/AuthContext'
+
+export function Login() {
+  const [username, setUsername] = useState('')
+  const [password, setPassword] = useState('')
+  const [error, setError] = useState('')
+  const [loading, setLoading] = useState(false)
+  const { login, user } = useAuth()
+  const navigate = useNavigate()
+
+  // Redirect if already logged in
+  if (user) {
+    navigate('/admin/dashboard', { replace: true })
+    return null
+  }
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault()
+    setError('')
+    setLoading(true)
+
+    try {
+      await login(username, password)
+      navigate('/admin/dashboard')
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Login failed')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-bg p-4">
+      <div className="w-full max-w-md">
+        <div className="bg-bg-card border border-border rounded-2xl p-8 shadow-xl">
+          <div className="text-center mb-8">
+            <h1 className="text-2xl font-bold text-text mb-2">Beheerder Login</h1>
+            <p className="text-text-muted">Log in om vragenlijsten te beheren</p>
+          </div>
+
+          {error && (
+            <div className="mb-6 p-4 bg-danger-muted border border-danger/30 rounded-lg text-danger text-sm">
+              {error}
+            </div>
+          )}
+
+          <form onSubmit={handleSubmit} className="space-y-6">
+            <div>
+              <label htmlFor="username" className="block text-sm font-medium text-text mb-2">
+                Gebruikersnaam
+              </label>
+              <input
+                type="text"
+                id="username"
+                value={username}
+                onChange={(e) => setUsername(e.target.value)}
+                className="w-full px-4 py-3 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                placeholder="Voer je gebruikersnaam in"
+                required
+                autoFocus
+              />
+            </div>
+
+            <div>
+              <label htmlFor="password" className="block text-sm font-medium text-text mb-2">
+                Wachtwoord
+              </label>
+              <input
+                type="password"
+                id="password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+                className="w-full px-4 py-3 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                placeholder="Voer je wachtwoord in"
+                required
+              />
+            </div>
+
+            <button
+              type="submit"
+              disabled={loading}
+              className="w-full py-3 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-all hover:-translate-y-0.5 hover:shadow-lg disabled:opacity-50 disabled:cursor-not-allowed disabled:transform-none"
+            >
+              {loading ? 'Inloggen...' : 'Inloggen'}
+            </button>
+          </form>
+        </div>
+      </div>
+    </div>
+  )
+}
+
--- a/src/pages/NotFound.tsx
+++ b/src/pages/NotFound.tsx
@@ -0,0 +1,19 @@
+import { Link } from 'react-router-dom'
+
+export function NotFound() {
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-bg p-4">
+      <div className="text-center">
+        <h1 className="text-4xl font-bold text-danger mb-4">Pagina Niet Gevonden</h1>
+        <p className="text-text-muted mb-8">De pagina die je zoekt bestaat niet.</p>
+        <Link
+          to="/"
+          className="inline-block px-6 py-3 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors"
+        >
+          Naar Home
+        </Link>
+      </div>
+    </div>
+  )
+}
+
--- a/src/pages/PublicQuestionnaire.tsx
+++ b/src/pages/PublicQuestionnaire.tsx
@@ -0,0 +1,673 @@
+import { useState, useEffect, FormEvent } from 'react'
+import { useParams } from 'react-router-dom'
+
+interface Activity {
+  id: number
+  name: string
+  description: string | null
+  added_by: string
+  upvotes: number
+  downvotes: number
+  net_votes: number
+  comment_count: number
+}
+
+interface Comment {
+  id: number
+  author_name: string
+  content: string
+  created_at: string
+  replies: Comment[]
+}
+
+interface Questionnaire {
+  id: number
+  uuid: string
+  slug: string
+  title: string
+  description: string | null
+  is_private: boolean
+}
+
+export function PublicQuestionnaire({ accessToken }: { accessToken?: string } = {}) {
+  const { slug, token } = useParams()
+  const effectiveToken = accessToken || token
+  const [questionnaire, setQuestionnaire] = useState<Questionnaire | null>(null)
+  const [activities, setActivities] = useState<Activity[]>([])
+  const [userVotes, setUserVotes] = useState<Record<number, number>>({})
+  const [visitorName, setVisitorName] = useState('')
+  const [nameInput, setNameInput] = useState('')
+  const [activityInput, setActivityInput] = useState('')
+  const [activityDescriptionInput, setActivityDescriptionInput] = useState('')
+  const [showDescriptionField, setShowDescriptionField] = useState(false)
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState('')
+  const [canWrite, setCanWrite] = useState(false)
+  const [isPrivate, setIsPrivate] = useState(false)
+  const [isParticipant, setIsParticipant] = useState(false)
+  
+  // Comments modal state
+  const [showComments, setShowComments] = useState(false)
+  const [selectedActivity, setSelectedActivity] = useState<Activity | null>(null)
+  const [comments, setComments] = useState<Comment[]>([])
+  const [commentInput, setCommentInput] = useState('')
+  const [replyTo, setReplyTo] = useState<{ id: number; name: string } | null>(null)
+  const [commentsLoading, setCommentsLoading] = useState(false)
+  
+  // Edit activity modal state
+  const [showEditModal, setShowEditModal] = useState(false)
+  const [editingActivity, setEditingActivity] = useState<Activity | null>(null)
+  const [editNameInput, setEditNameInput] = useState('')
+  const [editDescriptionInput, setEditDescriptionInput] = useState('')
+  const [editLoading, setEditLoading] = useState(false)
+
+  useEffect(() => {
+    fetchQuestionnaire()
+  }, [slug, effectiveToken])
+
+  async function fetchQuestionnaire() {
+    try {
+      // Use token-based access if available
+      const url = effectiveToken 
+        ? `/api/q/token/${effectiveToken}`
+        : `/api/q/${slug}`
+      
+      const res = await fetch(url, { credentials: 'include' })
+      if (!res.ok) {
+        setError(effectiveToken ? 'Ongeldige toegangslink' : 'Vragenlijst niet gevonden')
+        return
+      }
+      const data = await res.json()
+      setQuestionnaire(data.questionnaire)
+      setActivities(data.activities)
+      setUserVotes(data.userVotes)
+      setVisitorName(data.visitorName || '')
+      setCanWrite(data.canWrite ?? !data.isPrivate)
+      setIsPrivate(data.isPrivate ?? false)
+      setIsParticipant(data.isParticipant ?? false)
+    } catch (err) {
+      setError('Vragenlijst laden mislukt')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  async function handleSetName(e: FormEvent) {
+    e.preventDefault()
+    if (!nameInput.trim() || isPrivate) return
+
+    try {
+      const res = await fetch(`/api/q/${questionnaire?.slug}/set-name`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ name: nameInput.trim() }),
+      })
+      const data = await res.json()
+      if (data.success) {
+        setVisitorName(data.name)
+        setCanWrite(true)
+        setNameInput('')
+      }
+    } catch (err) {
+      console.error('Failed to set name:', err)
+    }
+  }
+
+  async function handleAddActivity(e: FormEvent) {
+    e.preventDefault()
+    if (!activityInput.trim() || !canWrite) return
+
+    try {
+      const res = await fetch(`/api/q/${questionnaire?.slug}/activities`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ 
+          name: activityInput.trim(),
+          description: activityDescriptionInput.trim() || null
+        }),
+      })
+      const data = await res.json()
+      if (data.success) {
+        setActivityInput('')
+        setActivityDescriptionInput('')
+        setShowDescriptionField(false)
+        refreshActivities()
+      }
+    } catch (err) {
+      console.error('Failed to add activity:', err)
+    }
+  }
+
+  async function refreshActivities() {
+    try {
+      const res = await fetch(`/api/q/${questionnaire?.slug}/activities`, { credentials: 'include' })
+      const data = await res.json()
+      setActivities(data.activities)
+      setUserVotes(data.userVotes)
+    } catch (err) {
+      console.error('Failed to refresh activities:', err)
+    }
+  }
+
+  function openEditModal(activity: Activity) {
+    setEditingActivity(activity)
+    setEditNameInput(activity.name)
+    setEditDescriptionInput(activity.description || '')
+    setShowEditModal(true)
+  }
+
+  async function handleEditActivity(e: FormEvent) {
+    e.preventDefault()
+    if (!editingActivity || !editNameInput.trim() || !canWrite) return
+
+    setEditLoading(true)
+    try {
+      const res = await fetch(`/api/q/${questionnaire?.slug}/activities/${editingActivity.id}`, {
+        method: 'PUT',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ 
+          name: editNameInput.trim(),
+          description: editDescriptionInput.trim() || null
+        }),
+      })
+      const data = await res.json()
+      if (data.success) {
+        setShowEditModal(false)
+        setEditingActivity(null)
+        refreshActivities()
+      } else {
+        alert(data.error || 'Bewerken mislukt')
+      }
+    } catch (err) {
+      console.error('Failed to edit activity:', err)
+    } finally {
+      setEditLoading(false)
+    }
+  }
+
+  async function handleVote(activityId: number, voteType: number) {
+    if (!canWrite) return
+
+    try {
+      const res = await fetch(`/api/q/${questionnaire?.slug}/activities/${activityId}/vote`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ voteType }),
+      })
+      const data = await res.json()
+      if (data.success) {
+        setUserVotes(prev => ({ ...prev, [activityId]: data.currentVote }))
+        setActivities(prev => 
+          prev.map(a => a.id === activityId ? data.activity : a)
+            .sort((a, b) => b.net_votes - a.net_votes)
+        )
+      }
+    } catch (err) {
+      console.error('Failed to vote:', err)
+    }
+  }
+
+  async function openComments(activity: Activity) {
+    setSelectedActivity(activity)
+    setShowComments(true)
+    setCommentsLoading(true)
+    setReplyTo(null)
+    setCommentInput('')
+
+    try {
+      const res = await fetch(`/api/q/${questionnaire?.slug}/activities/${activity.id}/comments`, { credentials: 'include' })
+      const data = await res.json()
+      setComments(data.comments)
+    } catch (err) {
+      console.error('Failed to load comments:', err)
+    } finally {
+      setCommentsLoading(false)
+    }
+  }
+
+  async function handleAddComment(e: FormEvent) {
+    e.preventDefault()
+    if (!commentInput.trim() || !selectedActivity || !canWrite) return
+
+    try {
+      const res = await fetch(`/api/q/${questionnaire?.slug}/activities/${selectedActivity.id}/comments`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ 
+          content: commentInput.trim(), 
+          parentId: replyTo?.id || null 
+        }),
+      })
+      const data = await res.json()
+      if (data.success) {
+        setCommentInput('')
+        setReplyTo(null)
+        // Reload comments
+        openComments(selectedActivity)
+        // Update comment count
+        setActivities(prev => 
+          prev.map(a => a.id === selectedActivity.id 
+            ? { ...a, comment_count: a.comment_count + 1 } 
+            : a
+          )
+        )
+      }
+    } catch (err) {
+      console.error('Failed to add comment:', err)
+    }
+  }
+
+  function formatTime(dateStr: string) {
+    const date = new Date(dateStr)
+    const now = new Date()
+    const diffMs = now.getTime() - date.getTime()
+    const diffMins = Math.floor(diffMs / 60000)
+    const diffHours = Math.floor(diffMs / 3600000)
+    const diffDays = Math.floor(diffMs / 86400000)
+
+    if (diffMins < 1) return 'zojuist'
+    if (diffMins < 60) return `${diffMins} min geleden`
+    if (diffHours < 24) return `${diffHours} uur geleden`
+    if (diffDays < 7) return `${diffDays} dagen geleden`
+    return date.toLocaleDateString('nl-NL')
+  }
+
+  function renderComment(comment: Comment, depth = 0) {
+    return (
+      <div key={comment.id} className="mt-3 first:mt-0" style={{ marginLeft: Math.min(depth, 3) * 16 }}>
+        <div className="flex items-center gap-2 mb-1">
+          <span className="text-sm font-semibold text-accent">{comment.author_name}</span>
+          <span className="text-xs text-text-faint">{formatTime(comment.created_at)}</span>
+        </div>
+        <div className="text-sm text-text bg-bg-input rounded-lg px-3 py-2 mb-1">
+          {comment.content}
+        </div>
+        {canWrite && (
+          <button 
+            onClick={() => setReplyTo({ id: comment.id, name: comment.author_name })}
+            className="text-xs text-text-faint hover:text-accent transition-colors"
+          >
+            Reageren
+          </button>
+        )}
+        {comment.replies?.map(reply => renderComment(reply, depth + 1))}
+      </div>
+    )
+  }
+
+  if (loading) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-bg">
+        <div className="text-text-muted">Laden...</div>
+      </div>
+    )
+  }
+
+  if (error || !questionnaire) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-bg">
+        <div className="text-center">
+          <h1 className="text-2xl font-bold text-danger mb-2">Niet Gevonden</h1>
+          <p className="text-text-muted">{error || 'Deze vragenlijst bestaat niet.'}</p>
+        </div>
+      </div>
+    )
+  }
+
+  return (
+    <div className="min-h-screen bg-bg">
+      <div className="max-w-3xl mx-auto px-4 py-8">
+        {/* Header */}
+        <div className="text-center mb-8 pb-8 border-b border-border">
+          <h1 className="text-3xl sm:text-4xl font-bold bg-gradient-to-r from-text to-accent bg-clip-text text-transparent mb-2">
+            {questionnaire.title}
+          </h1>
+          {questionnaire.description && (
+            <p className="text-lg text-text-muted">{questionnaire.description}</p>
+          )}
+          {isPrivate && !canWrite && (
+            <div className="mt-4 inline-block px-4 py-2 bg-bg-card border border-border rounded-lg">
+              <span className="text-text-muted text-sm">👁️ Alleen lezen</span>
+            </div>
+          )}
+        </div>
+
+        {/* Visitor Name Section */}
+        {!isPrivate && !isParticipant && (
+          <div className="mb-8">
+            {visitorName ? (
+              <div className="flex items-center justify-center gap-3 p-4 bg-bg-card border border-border rounded-xl">
+                <span className="text-text-muted">Deelnemen als: <strong className="text-text">{visitorName}</strong></span>
+                <button 
+                  onClick={() => setVisitorName('')}
+                  className="px-3 py-1 text-sm border border-border rounded-md text-text-muted hover:text-text hover:border-text-muted transition-colors"
+                >
+                  Wijzigen
+                </button>
+              </div>
+            ) : (
+              <div className="bg-bg-card border border-border rounded-xl p-6 text-center">
+                <h3 className="font-semibold text-text mb-4">Voer je naam in om deel te nemen</h3>
+                <form onSubmit={handleSetName} className="flex gap-2 max-w-sm mx-auto">
+                  <input
+                    type="text"
+                    value={nameInput}
+                    onChange={(e) => setNameInput(e.target.value)}
+                    placeholder="Je naam"
+                    className="flex-1 px-4 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                    required
+                  />
+                  <button 
+                    type="submit"
+                    className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors"
+                  >
+                    Deelnemen
+                  </button>
+                </form>
+              </div>
+            )}
+          </div>
+        )}
+
+        {/* Show participant name for token-based access or private questionnaires (name cannot be changed) */}
+        {(isParticipant || isPrivate) && canWrite && visitorName && (
+          <div className="mb-8">
+            <div className="flex items-center justify-center gap-3 p-4 bg-bg-card border border-border rounded-xl">
+              <span className="text-text-muted">Deelnemen als: <strong className="text-text">{visitorName}</strong></span>
+            </div>
+          </div>
+        )}
+
+        {/* Add Activity */}
+        {canWrite && (
+          <div className="bg-bg-card border border-border rounded-xl p-5 mb-8">
+            <h3 className="font-semibold text-text mb-3">Activiteit Toevoegen</h3>
+            <form onSubmit={handleAddActivity} className="space-y-3">
+              <div className="flex gap-2">
+                <input
+                  type="text"
+                  value={activityInput}
+                  onChange={(e) => setActivityInput(e.target.value)}
+                  placeholder="Naam activiteit"
+                  className="flex-1 px-4 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                  required
+                />
+                <button 
+                  type="submit"
+                  className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors"
+                >
+                  Toevoegen
+                </button>
+              </div>
+              {!showDescriptionField ? (
+                <button
+                  type="button"
+                  onClick={() => setShowDescriptionField(true)}
+                  className="text-xs text-text-muted hover:text-accent transition-colors"
+                >
+                  + Beschrijving toevoegen
+                </button>
+              ) : (
+                <div className="flex gap-2">
+                  <input
+                    type="text"
+                    value={activityDescriptionInput}
+                    onChange={(e) => setActivityDescriptionInput(e.target.value)}
+                    placeholder="Korte beschrijving (optioneel)"
+                    className="flex-1 px-4 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint text-sm focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                  />
+                  <button
+                    type="button"
+                    onClick={() => {
+                      setShowDescriptionField(false)
+                      setActivityDescriptionInput('')
+                    }}
+                    className="px-2 text-text-faint hover:text-danger transition-colors"
+                  >
+                    ×
+                  </button>
+                </div>
+              )}
+            </form>
+          </div>
+        )}
+
+        {/* Activities List */}
+        <h2 className="font-semibold text-text mb-4">Activiteiten</h2>
+        
+        {activities.length > 0 ? (
+          <div className="space-y-2">
+            {activities.map((activity) => (
+              <div 
+                key={activity.id}
+                className="bg-bg-card border border-border rounded-lg p-3 hover:bg-bg-elevated transition-colors"
+              >
+                <div className="flex items-center gap-3">
+                  {/* Votes */}
+                  <div className="flex items-center gap-1">
+                    <button
+                      onClick={() => handleVote(activity.id, 1)}
+                      disabled={!canWrite}
+                      className={`w-6 h-6 flex items-center justify-center border rounded text-xs transition-colors ${
+                        userVotes[activity.id] === 1 
+                          ? 'border-success text-success bg-success-muted' 
+                          : 'border-border text-text-faint hover:border-success hover:text-success disabled:opacity-30 disabled:cursor-not-allowed'
+                      }`}
+                    >
+                      ▲
+                    </button>
+                    <span className="w-6 text-center font-mono font-bold text-sm text-text">
+                      {activity.net_votes}
+                    </span>
+                    <button
+                      onClick={() => handleVote(activity.id, -1)}
+                      disabled={!canWrite}
+                      className={`w-6 h-6 flex items-center justify-center border rounded text-xs transition-colors ${
+                        userVotes[activity.id] === -1 
+                          ? 'border-danger text-danger bg-danger-muted' 
+                          : 'border-border text-text-faint hover:border-danger hover:text-danger disabled:opacity-30 disabled:cursor-not-allowed'
+                      }`}
+                    >
+                      ▼
+                    </button>
+                  </div>
+
+                  {/* Content */}
+                  <div 
+                    className="flex-1 cursor-pointer min-w-0" 
+                    onClick={() => openComments(activity)}
+                  >
+                    <span className="font-medium text-text">{activity.name}</span>
+                    <span className="text-xs text-text-faint ml-2">door {activity.added_by}</span>
+                  </div>
+
+                  {/* Edit button (only for own activities) */}
+                  {canWrite && activity.added_by === visitorName && (
+                    <button
+                      onClick={() => openEditModal(activity)}
+                      className="px-2 py-1 border border-border rounded text-xs text-text-muted hover:border-accent hover:text-accent transition-colors shrink-0"
+                      title="Bewerken"
+                    >
+                      ✏️
+                    </button>
+                  )}
+
+                  {/* Comment button */}
+                  <button
+                    onClick={() => openComments(activity)}
+                    className="flex items-center gap-1 px-2 py-1 border border-border rounded text-xs text-text-muted hover:border-accent hover:text-accent transition-colors shrink-0"
+                  >
+                    💬 <span className="font-mono font-semibold">{activity.comment_count}</span>
+                  </button>
+
+                  {/* Stats */}
+                  <div className="flex gap-2 text-xs font-mono font-semibold shrink-0">
+                    <span className="text-success">+{activity.upvotes}</span>
+                    <span className="text-danger">-{activity.downvotes}</span>
+                  </div>
+                </div>
+                {activity.description && (
+                  <p className="mt-2 ml-[76px] text-sm text-text-muted">{activity.description}</p>
+                )}
+              </div>
+            ))}
+          </div>
+        ) : (
+          <div className="text-center py-8 bg-bg-card border border-dashed border-border rounded-xl">
+            <p className="text-text-muted">Nog geen activiteiten. Wees de eerste om er één toe te voegen!</p>
+          </div>
+        )}
+      </div>
+
+      {/* Comments Modal */}
+      {showComments && (
+        <div 
+          className="fixed inset-0 bg-black/70 backdrop-blur-sm flex items-center justify-center z-50 p-4"
+          onClick={() => setShowComments(false)}
+        >
+          <div 
+            className="bg-bg-card border border-border rounded-2xl w-full max-w-lg max-h-[80vh] flex flex-col"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* Header */}
+            <div className="flex items-start justify-between p-4 border-b border-border">
+              <div className="pr-4 min-w-0">
+                <h3 className="font-semibold text-text truncate">{selectedActivity?.name}</h3>
+                {selectedActivity?.description && (
+                  <p className="text-sm text-text-muted mt-1">{selectedActivity.description}</p>
+                )}
+              </div>
+              <button 
+                onClick={() => setShowComments(false)}
+                className="text-2xl text-text-muted hover:text-text leading-none shrink-0"
+              >
+                ×
+              </button>
+            </div>
+
+            {/* Comments */}
+            <div className="flex-1 overflow-y-auto p-4 min-h-[200px]">
+              {commentsLoading ? (
+                <div className="text-center text-text-muted py-8">Reacties laden...</div>
+              ) : comments.length > 0 ? (
+                comments.map(comment => renderComment(comment))
+              ) : (
+                <div className="text-center text-text-muted py-8">Nog geen reacties. Wees de eerste om te reageren!</div>
+              )}
+            </div>
+
+            {/* Add Comment */}
+            {canWrite && (
+              <div className="p-4 border-t border-border">
+                {replyTo && (
+                  <div className="flex items-center gap-2 mb-2 px-3 py-2 bg-bg-input rounded text-sm text-text-muted">
+                    <span>Reageren op <strong className="text-accent">{replyTo.name}</strong></span>
+                    <button 
+                      onClick={() => setReplyTo(null)}
+                      className="ml-auto text-text-faint hover:text-danger"
+                    >
+                      ×
+                    </button>
+                  </div>
+                )}
+                <form onSubmit={handleAddComment} className="flex gap-2">
+                  <input
+                    type="text"
+                    value={commentInput}
+                    onChange={(e) => setCommentInput(e.target.value)}
+                    placeholder="Schrijf een reactie..."
+                    className="flex-1 px-3 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                    required
+                  />
+                  <button 
+                    type="submit"
+                    className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors"
+                  >
+                    Versturen
+                  </button>
+                </form>
+              </div>
+            )}
+          </div>
+        </div>
+      )}
+
+      {/* Edit Activity Modal */}
+      {showEditModal && editingActivity && (
+        <div 
+          className="fixed inset-0 bg-black/70 backdrop-blur-sm flex items-center justify-center z-50 p-4"
+          onClick={() => setShowEditModal(false)}
+        >
+          <div 
+            className="bg-bg-card border border-border rounded-2xl w-full max-w-md"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* Header */}
+            <div className="flex items-center justify-between p-4 border-b border-border">
+              <h3 className="font-semibold text-text">Activiteit Bewerken</h3>
+              <button 
+                onClick={() => setShowEditModal(false)}
+                className="text-2xl text-text-muted hover:text-text leading-none"
+              >
+                ×
+              </button>
+            </div>
+
+            {/* Form */}
+            <form onSubmit={handleEditActivity} className="p-4 space-y-4">
+              <div>
+                <label className="block text-sm font-medium text-text mb-2">
+                  Naam <span className="text-danger">*</span>
+                </label>
+                <input
+                  type="text"
+                  value={editNameInput}
+                  onChange={(e) => setEditNameInput(e.target.value)}
+                  className="w-full px-4 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                  required
+                  autoFocus
+                />
+              </div>
+
+              <div>
+                <label className="block text-sm font-medium text-text mb-2">
+                  Beschrijving
+                </label>
+                <input
+                  type="text"
+                  value={editDescriptionInput}
+                  onChange={(e) => setEditDescriptionInput(e.target.value)}
+                  placeholder="Korte beschrijving (optioneel)"
+                  className="w-full px-4 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                />
+              </div>
+
+              <div className="flex gap-3 justify-end pt-2">
+                <button
+                  type="button"
+                  onClick={() => setShowEditModal(false)}
+                  className="px-4 py-2 border border-border rounded-lg text-text-muted hover:text-text hover:border-text-muted transition-colors"
+                >
+                  Annuleren
+                </button>
+                <button
+                  type="submit"
+                  disabled={editLoading}
+                  className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors disabled:opacity-50"
+                >
+                  {editLoading ? 'Opslaan...' : 'Opslaan'}
+                </button>
+              </div>
+            </form>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}
+
--- a/src/pages/QuestionnaireDetail.tsx
+++ b/src/pages/QuestionnaireDetail.tsx
@@ -0,0 +1,453 @@
+import { useState, useEffect, FormEvent } from 'react'
+import { useParams, Link, useNavigate } from 'react-router-dom'
+
+interface Activity {
+  id: number
+  name: string
+  description: string | null
+  added_by: string
+  upvotes: number
+  downvotes: number
+  net_votes: number
+  comment_count: number
+}
+
+interface Participant {
+  id: number
+  name: string
+  token: string
+  created_at: string
+}
+
+interface Questionnaire {
+  id: number
+  uuid: string
+  slug: string
+  title: string
+  description: string | null
+  is_private: boolean
+  created_at: string
+}
+
+export function QuestionnaireDetail() {
+  const { id } = useParams()
+  const navigate = useNavigate()
+  const [questionnaire, setQuestionnaire] = useState<Questionnaire | null>(null)
+  const [activities, setActivities] = useState<Activity[]>([])
+  const [participants, setParticipants] = useState<Participant[]>([])
+  const [loading, setLoading] = useState(true)
+  const [copied, setCopied] = useState('')
+  const [newParticipantName, setNewParticipantName] = useState('')
+  const [addingParticipant, setAddingParticipant] = useState(false)
+  
+  // Edit activity modal state
+  const [showEditModal, setShowEditModal] = useState(false)
+  const [editingActivity, setEditingActivity] = useState<Activity | null>(null)
+  const [editNameInput, setEditNameInput] = useState('')
+  const [editDescriptionInput, setEditDescriptionInput] = useState('')
+  const [editLoading, setEditLoading] = useState(false)
+
+  useEffect(() => {
+    fetchData()
+  }, [id])
+
+  async function fetchData() {
+    try {
+      const res = await fetch(`/api/admin/questionnaires/${id}`, { credentials: 'include' })
+      const data = await res.json()
+      setQuestionnaire(data.questionnaire)
+      setActivities(data.activities)
+      
+      // Fetch participants if private
+      if (data.questionnaire?.is_private) {
+        fetchParticipants()
+      }
+    } catch (error) {
+      console.error('Failed to fetch questionnaire:', error)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  async function fetchParticipants() {
+    try {
+      const res = await fetch(`/api/admin/questionnaires/${id}/participants`, { credentials: 'include' })
+      const data = await res.json()
+      setParticipants(data)
+    } catch (error) {
+      console.error('Failed to fetch participants:', error)
+    }
+  }
+
+  async function handleAddParticipant(e: FormEvent) {
+    e.preventDefault()
+    if (!newParticipantName.trim()) return
+    
+    setAddingParticipant(true)
+    try {
+      const res = await fetch(`/api/admin/questionnaires/${id}/participants`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ name: newParticipantName.trim() }),
+      })
+      const data = await res.json()
+      if (data.success) {
+        setNewParticipantName('')
+        fetchParticipants()
+      }
+    } catch (error) {
+      console.error('Failed to add participant:', error)
+    } finally {
+      setAddingParticipant(false)
+    }
+  }
+
+  async function handleDeleteParticipant(participantId: number) {
+    if (!confirm('Deze deelnemer verwijderen?')) return
+    
+    try {
+      await fetch(`/api/admin/participants/${participantId}`, {
+        method: 'DELETE',
+        credentials: 'include',
+      })
+      setParticipants(participants.filter(p => p.id !== participantId))
+    } catch (error) {
+      console.error('Failed to delete participant:', error)
+    }
+  }
+
+  async function handleDelete() {
+    if (!confirm('Weet je zeker dat je deze vragenlijst wilt verwijderen? Dit verwijdert ook alle activiteiten en stemmen.')) {
+      return
+    }
+
+    try {
+      await fetch(`/api/admin/questionnaires/${id}`, {
+        method: 'DELETE',
+        credentials: 'include',
+      })
+      navigate('/admin/dashboard')
+    } catch (error) {
+      console.error('Failed to delete:', error)
+    }
+  }
+
+  async function handleDeleteActivity(activityId: number) {
+    if (!confirm('Deze activiteit verwijderen?')) return
+
+    try {
+      await fetch(`/api/admin/activities/${activityId}`, {
+        method: 'DELETE',
+        credentials: 'include',
+      })
+      setActivities(activities.filter(a => a.id !== activityId))
+    } catch (error) {
+      console.error('Failed to delete activity:', error)
+    }
+  }
+
+  function openEditModal(activity: Activity) {
+    setEditingActivity(activity)
+    setEditNameInput(activity.name)
+    setEditDescriptionInput(activity.description || '')
+    setShowEditModal(true)
+  }
+
+  async function handleEditActivity(e: FormEvent) {
+    e.preventDefault()
+    if (!editingActivity || !editNameInput.trim()) return
+
+    setEditLoading(true)
+    try {
+      const res = await fetch(`/api/admin/activities/${editingActivity.id}`, {
+        method: 'PUT',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ 
+          name: editNameInput.trim(),
+          description: editDescriptionInput.trim() || null
+        }),
+      })
+      const data = await res.json()
+      if (data.success) {
+        setShowEditModal(false)
+        setEditingActivity(null)
+        // Update the activity in the list
+        setActivities(activities.map(a => 
+          a.id === editingActivity.id 
+            ? { ...a, name: editNameInput.trim(), description: editDescriptionInput.trim() || null }
+            : a
+        ))
+      } else {
+        alert(data.error || 'Bewerken mislukt')
+      }
+    } catch (error) {
+      console.error('Failed to edit activity:', error)
+    } finally {
+      setEditLoading(false)
+    }
+  }
+
+  function copyUrl(url: string, key: string) {
+    navigator.clipboard.writeText(url)
+    setCopied(key)
+    setTimeout(() => setCopied(''), 2000)
+  }
+
+  if (loading) {
+    return <div className="text-text-muted">Laden...</div>
+  }
+
+  if (!questionnaire) {
+    return <div className="text-text-muted">Vragenlijst niet gevonden</div>
+  }
+
+  const shareUrl = `${window.location.origin}/q/${questionnaire.slug}`
+
+  return (
+    <div>
+      <Link to="/admin/dashboard" className="inline-block text-text-muted hover:text-accent text-sm mb-4 transition-colors">
+        ← Terug naar Dashboard
+      </Link>
+
+      <div className="flex items-center gap-3 mb-2">
+        <h1 className="text-2xl font-bold text-text">{questionnaire.title}</h1>
+        {questionnaire.is_private && (
+          <span className="px-2 py-0.5 bg-accent/20 text-accent text-xs font-semibold rounded">Privé</span>
+        )}
+      </div>
+      {questionnaire.description && (
+        <p className="text-text-muted mb-6">{questionnaire.description}</p>
+      )}
+
+      {/* Share Box */}
+      <div className="bg-bg-card border border-border rounded-xl p-5 mb-8">
+        <h3 className="font-semibold text-text mb-3">
+          {questionnaire.is_private ? 'Publieke URL (Alleen Lezen)' : 'Deel deze vragenlijst'}
+        </h3>
+        <div className="flex gap-2 mb-2">
+          <input
+            type="text"
+            value={shareUrl}
+            readOnly
+            className="flex-1 px-3 py-2 bg-bg-input border border-border rounded-lg text-sm font-mono text-text"
+          />
+          <button
+            onClick={() => copyUrl(shareUrl, 'share')}
+            className="px-4 py-2 bg-bg-input border border-border rounded-lg text-sm font-medium text-text hover:bg-bg-elevated transition-colors"
+          >
+            {copied === 'share' ? 'Gekopieerd!' : 'Kopiëren'}
+          </button>
+        </div>
+        <p className="text-xs text-text-faint">
+          {questionnaire.is_private 
+            ? 'Iedereen met deze link kan activiteiten en stemmen bekijken, maar niet deelnemen.'
+            : 'Deel deze URL met mensen die activiteiten moeten toevoegen en stemmen.'}
+        </p>
+      </div>
+
+      {/* Participants Section (for private questionnaires) */}
+      {questionnaire.is_private && (
+        <div className="bg-bg-card border border-border rounded-xl p-5 mb-8">
+          <h3 className="font-semibold text-text mb-4">Uitgenodigde Deelnemers</h3>
+          <p className="text-sm text-text-muted mb-4">
+            Voeg mensen toe die kunnen deelnemen aan deze vragenlijst. Elke persoon krijgt een unieke link.
+          </p>
+          
+          {/* Add Participant Form */}
+          <form onSubmit={handleAddParticipant} className="flex gap-2 mb-4">
+            <input
+              type="text"
+              value={newParticipantName}
+              onChange={(e) => setNewParticipantName(e.target.value)}
+              placeholder="Naam deelnemer"
+              className="flex-1 px-3 py-2 bg-bg-input border border-border rounded-lg text-sm text-text placeholder-text-faint focus:outline-none focus:border-accent"
+              required
+            />
+            <button
+              type="submit"
+              disabled={addingParticipant}
+              className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-medium rounded-lg text-sm transition-colors disabled:opacity-50"
+            >
+              {addingParticipant ? 'Toevoegen...' : 'Toevoegen'}
+            </button>
+          </form>
+
+          {/* Participants List */}
+          {participants.length > 0 ? (
+            <div className="space-y-2">
+              {participants.map((participant) => {
+                const participantUrl = `${window.location.origin}/q/access/${participant.token}`
+                return (
+                  <div key={participant.id} className="flex items-center gap-2 p-3 bg-bg-input rounded-lg">
+                    <div className="flex-1 min-w-0">
+                      <div className="font-medium text-text text-sm">{participant.name}</div>
+                      <div className="text-xs font-mono text-text-faint truncate">{participantUrl}</div>
+                    </div>
+                    <button
+                      onClick={() => copyUrl(participantUrl, `p-${participant.id}`)}
+                      className="px-3 py-1 text-xs font-medium text-text-muted hover:text-text border border-border rounded transition-colors"
+                    >
+                      {copied === `p-${participant.id}` ? 'Gekopieerd!' : 'Link Kopiëren'}
+                    </button>
+                    <button
+                      onClick={() => handleDeleteParticipant(participant.id)}
+                      className="px-2 py-1 text-xs font-medium text-danger hover:bg-danger-muted rounded transition-colors"
+                    >
+                      Verwijderen
+                    </button>
+                  </div>
+                )
+              })}
+            </div>
+          ) : (
+            <p className="text-sm text-text-faint italic">Nog geen deelnemers toegevoegd.</p>
+          )}
+        </div>
+      )}
+
+      {/* Activities */}
+      <h2 className="font-semibold text-text mb-4">Activiteiten ({activities.length})</h2>
+
+      {activities.length > 0 ? (
+        <div className="bg-bg-card border border-border rounded-xl overflow-hidden">
+          <table className="w-full">
+            <thead>
+              <tr className="bg-bg-elevated">
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-text-muted">Activiteit</th>
+                <th className="px-4 py-3 text-left text-xs font-semibold uppercase tracking-wider text-text-muted">Toegevoegd door</th>
+                <th className="px-4 py-3 text-center text-xs font-semibold uppercase tracking-wider text-text-muted">Voor</th>
+                <th className="px-4 py-3 text-center text-xs font-semibold uppercase tracking-wider text-text-muted">Tegen</th>
+                <th className="px-4 py-3 text-center text-xs font-semibold uppercase tracking-wider text-text-muted">Netto</th>
+                <th className="px-4 py-3 text-center text-xs font-semibold uppercase tracking-wider text-text-muted">Reacties</th>
+                <th className="px-4 py-3 text-right text-xs font-semibold uppercase tracking-wider text-text-muted">Acties</th>
+              </tr>
+            </thead>
+            <tbody className="divide-y divide-border-light">
+              {activities.map((activity) => (
+                <tr key={activity.id} className="hover:bg-bg-elevated transition-colors">
+                  <td className="px-4 py-3">
+                    <div className="font-medium text-text">{activity.name}</div>
+                    {activity.description && (
+                      <div className="text-sm text-text-muted mt-0.5">{activity.description}</div>
+                    )}
+                  </td>
+                  <td className="px-4 py-3 text-text-muted">{activity.added_by}</td>
+                  <td className="px-4 py-3 text-center font-mono font-semibold text-success">+{activity.upvotes}</td>
+                  <td className="px-4 py-3 text-center font-mono font-semibold text-danger">-{activity.downvotes}</td>
+                  <td className="px-4 py-3 text-center font-mono font-semibold text-text">{activity.net_votes}</td>
+                  <td className="px-4 py-3 text-center font-mono text-text-muted">{activity.comment_count}</td>
+                  <td className="px-4 py-3 text-right space-x-2">
+                    <button
+                      onClick={() => openEditModal(activity)}
+                      className="px-3 py-1 text-xs font-medium text-text-muted hover:text-accent hover:bg-bg-input rounded transition-colors"
+                    >
+                      Bewerken
+                    </button>
+                    <button
+                      onClick={() => handleDeleteActivity(activity.id)}
+                      className="px-3 py-1 text-xs font-medium text-danger hover:bg-danger-muted rounded transition-colors"
+                    >
+                      Verwijderen
+                    </button>
+                  </td>
+                </tr>
+              ))}
+            </tbody>
+          </table>
+        </div>
+      ) : (
+        <div className="text-center py-8 bg-bg-card border border-dashed border-border rounded-xl">
+          <p className="text-text-muted">Er zijn nog geen activiteiten toegevoegd. Deel de vragenlijst URL zodat mensen activiteiten kunnen toevoegen.</p>
+        </div>
+      )}
+
+      {/* Delete Section */}
+      <div className="mt-8 pt-8 border-t border-border">
+        <button
+          onClick={handleDelete}
+          className="px-4 py-2 bg-danger hover:bg-danger-hover text-white font-medium rounded-lg transition-colors"
+        >
+          Vragenlijst Verwijderen
+        </button>
+      </div>
+
+      {/* Edit Activity Modal */}
+      {showEditModal && editingActivity && (
+        <div 
+          className="fixed inset-0 bg-black/70 backdrop-blur-sm flex items-center justify-center z-50 p-4"
+          onClick={() => setShowEditModal(false)}
+        >
+          <div 
+            className="bg-bg-card border border-border rounded-2xl w-full max-w-md"
+            onClick={(e) => e.stopPropagation()}
+          >
+            {/* Header */}
+            <div className="flex items-center justify-between p-4 border-b border-border">
+              <h3 className="font-semibold text-text">Activiteit Bewerken</h3>
+              <button 
+                onClick={() => setShowEditModal(false)}
+                className="text-2xl text-text-muted hover:text-text leading-none"
+              >
+                ×
+              </button>
+            </div>
+
+            {/* Form */}
+            <form onSubmit={handleEditActivity} className="p-4 space-y-4">
+              <div>
+                <label className="block text-sm font-medium text-text mb-2">
+                  Naam <span className="text-danger">*</span>
+                </label>
+                <input
+                  type="text"
+                  value={editNameInput}
+                  onChange={(e) => setEditNameInput(e.target.value)}
+                  className="w-full px-4 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                  required
+                  autoFocus
+                />
+              </div>
+
+              <div>
+                <label className="block text-sm font-medium text-text mb-2">
+                  Beschrijving
+                </label>
+                <input
+                  type="text"
+                  value={editDescriptionInput}
+                  onChange={(e) => setEditDescriptionInput(e.target.value)}
+                  placeholder="Korte beschrijving (optioneel)"
+                  className="w-full px-4 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                />
+              </div>
+
+              <div className="text-xs text-text-faint">
+                Toegevoegd door: {editingActivity.added_by}
+              </div>
+
+              <div className="flex gap-3 justify-end pt-2">
+                <button
+                  type="button"
+                  onClick={() => setShowEditModal(false)}
+                  className="px-4 py-2 border border-border rounded-lg text-text-muted hover:text-text hover:border-text-muted transition-colors"
+                >
+                  Annuleren
+                </button>
+                <button
+                  type="submit"
+                  disabled={editLoading}
+                  className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors disabled:opacity-50"
+                >
+                  {editLoading ? 'Opslaan...' : 'Opslaan'}
+                </button>
+              </div>
+            </form>
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}
+
--- a/src/pages/QuestionnaireForm.tsx
+++ b/src/pages/QuestionnaireForm.tsx
@@ -0,0 +1,221 @@
+import { useState, useEffect, FormEvent } from 'react'
+import { useNavigate, useParams, Link } from 'react-router-dom'
+
+export function QuestionnaireForm() {
+  const { id } = useParams()
+  const isEditing = !!id
+  const navigate = useNavigate()
+  
+  const [title, setTitle] = useState('')
+  const [slug, setSlug] = useState('')
+  const [description, setDescription] = useState('')
+  const [isPrivate, setIsPrivate] = useState(false)
+  const [error, setError] = useState('')
+  const [slugError, setSlugError] = useState('')
+  const [loading, setLoading] = useState(false)
+
+  useEffect(() => {
+    if (isEditing) {
+      fetchQuestionnaire()
+    }
+  }, [id])
+
+  async function fetchQuestionnaire() {
+    try {
+      const res = await fetch(`/api/admin/questionnaires/${id}`, { credentials: 'include' })
+      const data = await res.json()
+      if (data.questionnaire) {
+        setTitle(data.questionnaire.title)
+        setSlug(data.questionnaire.slug)
+        setDescription(data.questionnaire.description || '')
+        setIsPrivate(!!data.questionnaire.is_private)
+      }
+    } catch (error) {
+      console.error('Failed to fetch questionnaire:', error)
+    }
+  }
+
+  // Auto-generate slug from title (only when creating new)
+  function handleTitleChange(value: string) {
+    setTitle(value)
+    if (!isEditing && !slug) {
+      const autoSlug = value
+        .toLowerCase()
+        .replace(/[^a-z0-9\s-]/g, '')
+        .replace(/\s+/g, '-')
+        .replace(/-+/g, '-')
+        .substring(0, 50)
+      setSlug(autoSlug)
+    }
+  }
+
+  function handleSlugChange(value: string) {
+    const cleanSlug = value
+      .toLowerCase()
+      .replace(/[^a-z0-9-]/g, '')
+      .substring(0, 50)
+    setSlug(cleanSlug)
+    setSlugError('')
+  }
+
+  async function checkSlugAvailability() {
+    if (!slug || slug.length < 3) return
+    
+    try {
+      const excludeParam = isEditing ? `?excludeId=${id}` : ''
+      const res = await fetch(`/api/admin/questionnaires/check-slug/${slug}${excludeParam}`, { credentials: 'include' })
+      const data = await res.json()
+      if (!data.available) {
+        setSlugError('Deze slug is al in gebruik')
+      }
+    } catch (err) {
+      console.error('Failed to check slug:', err)
+    }
+  }
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault()
+    setError('')
+    setLoading(true)
+
+    try {
+      const url = isEditing ? `/api/admin/questionnaires/${id}` : '/api/admin/questionnaires'
+      const method = isEditing ? 'PUT' : 'POST'
+      
+      const res = await fetch(url, {
+        method,
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ title, slug, description, isPrivate }),
+      })
+
+      const data = await res.json()
+
+      if (!res.ok) {
+        throw new Error(data.error || 'Vragenlijst opslaan mislukt')
+      }
+
+      navigate('/admin/dashboard')
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Opslaan mislukt')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  return (
+    <div className="max-w-2xl">
+      <Link to="/admin/dashboard" className="inline-block text-text-muted hover:text-accent text-sm mb-4 transition-colors">
+        ← Terug naar Dashboard
+      </Link>
+      
+      <h1 className="text-2xl font-bold text-text mb-8">
+        {isEditing ? 'Vragenlijst Bewerken' : 'Vragenlijst Maken'}
+      </h1>
+
+      <div className="bg-bg-card border border-border rounded-xl p-6">
+        {error && (
+          <div className="mb-6 p-4 bg-danger-muted border border-danger/30 rounded-lg text-danger text-sm">
+            {error}
+          </div>
+        )}
+
+        <form onSubmit={handleSubmit} className="space-y-6">
+          <div>
+            <label htmlFor="title" className="block text-sm font-medium text-text mb-2">
+              Titel <span className="text-danger">*</span>
+            </label>
+            <input
+              type="text"
+              id="title"
+              value={title}
+              onChange={(e) => handleTitleChange(e.target.value)}
+              className="w-full px-4 py-3 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+              placeholder="bijv. Teambuilding Activiteiten"
+              required
+              autoFocus
+            />
+          </div>
+
+          <div>
+            <label htmlFor="slug" className="block text-sm font-medium text-text mb-2">
+              URL Slug <span className="text-danger">*</span>
+            </label>
+            <div className="flex items-center gap-2">
+              <span className="text-text-muted text-sm">/q/</span>
+              <input
+                type="text"
+                id="slug"
+                value={slug}
+                onChange={(e) => handleSlugChange(e.target.value)}
+                onBlur={checkSlugAvailability}
+                className={`flex-1 px-4 py-3 bg-bg-input border rounded-lg text-text placeholder-text-faint focus:outline-none focus:ring-2 transition-colors font-mono ${
+                  slugError ? 'border-danger focus:border-danger focus:ring-danger/20' : 'border-border focus:border-accent focus:ring-accent/20'
+                }`}
+                placeholder="teambuilding-2024"
+                required
+                minLength={3}
+                maxLength={50}
+              />
+            </div>
+            {slugError && (
+              <p className="mt-1 text-sm text-danger">{slugError}</p>
+            )}
+            <p className="mt-1 text-xs text-text-faint">
+              Alleen kleine letters, cijfers en koppeltekens. 3-50 tekens.
+            </p>
+          </div>
+
+          <div>
+            <label htmlFor="description" className="block text-sm font-medium text-text mb-2">
+              Beschrijving
+            </label>
+            <textarea
+              id="description"
+              value={description}
+              onChange={(e) => setDescription(e.target.value)}
+              rows={3}
+              className="w-full px-4 py-3 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors resize-y"
+              placeholder="Optionele beschrijving voor deelnemers"
+            />
+          </div>
+
+          <div className="flex items-center gap-3 p-4 bg-bg-input rounded-lg border border-border">
+            <input
+              type="checkbox"
+              id="isPrivate"
+              checked={isPrivate}
+              onChange={(e) => setIsPrivate(e.target.checked)}
+              className="w-5 h-5 rounded border-border text-accent focus:ring-accent focus:ring-offset-0 bg-bg-input"
+            />
+            <div>
+              <label htmlFor="isPrivate" className="block font-medium text-text cursor-pointer">
+                Privé Vragenlijst
+              </label>
+              <p className="text-sm text-text-muted">
+                Alleen uitgenodigde deelnemers kunnen items toevoegen en stemmen. Anderen kunnen alleen bekijken.
+              </p>
+            </div>
+          </div>
+
+          <div className="flex gap-3 justify-end pt-4">
+            <Link
+              to="/admin/dashboard"
+              className="px-4 py-2 border border-border rounded-lg text-text-muted hover:text-text hover:border-text-muted transition-colors"
+            >
+              Annuleren
+            </Link>
+            <button
+              type="submit"
+              disabled={loading}
+              className="px-4 py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              {loading ? 'Opslaan...' : isEditing ? 'Wijzigingen Opslaan' : 'Vragenlijst Maken'}
+            </button>
+          </div>
+        </form>
+      </div>
+    </div>
+  )
+}
+
--- a/src/pages/Users.tsx
+++ b/src/pages/Users.tsx
@@ -0,0 +1,215 @@
+import { useState, useEffect, FormEvent } from 'react'
+import { useAuth } from '../context/AuthContext'
+
+interface User {
+  id: number
+  username: string
+  created_at: string
+}
+
+export function Users() {
+  const { user: currentUser } = useAuth()
+  const [users, setUsers] = useState<User[]>([])
+  const [username, setUsername] = useState('')
+  const [password, setPassword] = useState('')
+  const [confirmPassword, setConfirmPassword] = useState('')
+  const [error, setError] = useState('')
+  const [loading, setLoading] = useState(false)
+
+  useEffect(() => {
+    fetchUsers()
+  }, [])
+
+  async function fetchUsers() {
+    try {
+      const res = await fetch('/api/admin/users', { credentials: 'include' })
+      const data = await res.json()
+      setUsers(data)
+    } catch (error) {
+      console.error('Failed to fetch users:', error)
+    }
+  }
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault()
+    setError('')
+
+    if (password !== confirmPassword) {
+      setError('Wachtwoorden komen niet overeen')
+      return
+    }
+
+    setLoading(true)
+
+    try {
+      const res = await fetch('/api/admin/users', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ username, password }),
+      })
+
+      const data = await res.json()
+
+      if (!res.ok) {
+        throw new Error(data.error || 'Gebruiker aanmaken mislukt')
+      }
+
+      setUsername('')
+      setPassword('')
+      setConfirmPassword('')
+      fetchUsers()
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Gebruiker aanmaken mislukt')
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  async function handleDelete(userId: number, username: string) {
+    if (!confirm(`Gebruiker ${username} verwijderen?`)) return
+
+    try {
+      const res = await fetch(`/api/admin/users/${userId}`, {
+        method: 'DELETE',
+        credentials: 'include',
+      })
+
+      const data = await res.json()
+
+      if (!res.ok) {
+        throw new Error(data.error || 'Gebruiker verwijderen mislukt')
+      }
+
+      fetchUsers()
+    } catch (err) {
+      alert(err instanceof Error ? err.message : 'Gebruiker verwijderen mislukt')
+    }
+  }
+
+  function formatDate(dateStr: string) {
+    return new Date(dateStr).toLocaleDateString('nl-NL', {
+      year: 'numeric',
+      month: 'short',
+      day: 'numeric',
+    })
+  }
+
+  return (
+    <div>
+      <h1 className="text-2xl font-bold text-text mb-8">Gebruikersbeheer</h1>
+
+      <div className="grid gap-8 lg:grid-cols-2">
+        {/* Add User Form */}
+        <div className="bg-bg-card border border-border rounded-xl p-6">
+          <h2 className="font-semibold text-text mb-4">Nieuwe Gebruiker Toevoegen</h2>
+
+          {error && (
+            <div className="mb-4 p-3 bg-danger-muted border border-danger/30 rounded-lg text-danger text-sm">
+              {error}
+            </div>
+          )}
+
+          <form onSubmit={handleSubmit} className="space-y-4">
+            <div>
+              <label htmlFor="username" className="block text-sm font-medium text-text mb-1.5">
+                Gebruikersnaam
+              </label>
+              <input
+                type="text"
+                id="username"
+                value={username}
+                onChange={(e) => setUsername(e.target.value)}
+                className="w-full px-3 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                placeholder="Voer gebruikersnaam in"
+                required
+              />
+            </div>
+
+            <div>
+              <label htmlFor="password" className="block text-sm font-medium text-text mb-1.5">
+                Wachtwoord
+              </label>
+              <input
+                type="password"
+                id="password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+                className="w-full px-3 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                placeholder="Min. 6 tekens"
+                minLength={6}
+                required
+              />
+            </div>
+
+            <div>
+              <label htmlFor="confirmPassword" className="block text-sm font-medium text-text mb-1.5">
+                Bevestig Wachtwoord
+              </label>
+              <input
+                type="password"
+                id="confirmPassword"
+                value={confirmPassword}
+                onChange={(e) => setConfirmPassword(e.target.value)}
+                className="w-full px-3 py-2 bg-bg-input border border-border rounded-lg text-text placeholder-text-faint focus:outline-none focus:border-accent focus:ring-2 focus:ring-accent/20 transition-colors"
+                placeholder="Herhaal wachtwoord"
+                required
+              />
+            </div>
+
+            <button
+              type="submit"
+              disabled={loading}
+              className="w-full py-2 bg-accent hover:bg-accent-hover text-white font-semibold rounded-lg transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
+            >
+              {loading ? 'Toevoegen...' : 'Gebruiker Toevoegen'}
+            </button>
+          </form>
+        </div>
+
+        {/* Users List */}
+        <div className="bg-bg-card border border-border rounded-xl p-6">
+          <h2 className="font-semibold text-text mb-4">Bestaande Gebruikers</h2>
+
+          {users.length > 0 ? (
+            <table className="w-full">
+              <thead>
+                <tr className="border-b border-border-light">
+                  <th className="pb-2 text-left text-xs font-semibold uppercase tracking-wider text-text-muted">Gebruikersnaam</th>
+                  <th className="pb-2 text-left text-xs font-semibold uppercase tracking-wider text-text-muted">Aangemaakt</th>
+                  <th className="pb-2 text-right text-xs font-semibold uppercase tracking-wider text-text-muted">Acties</th>
+                </tr>
+              </thead>
+              <tbody className="divide-y divide-border-light">
+                {users.map((user) => (
+                  <tr key={user.id}>
+                    <td className="py-3 text-text">
+                      {user.username}
+                      {user.id === currentUser?.id && (
+                        <span className="ml-2 px-1.5 py-0.5 text-xs bg-bg-input rounded text-text-muted">Jij</span>
+                      )}
+                    </td>
+                    <td className="py-3 text-text-muted text-sm">{formatDate(user.created_at)}</td>
+                    <td className="py-3 text-right">
+                      {user.id !== currentUser?.id && (
+                        <button
+                          onClick={() => handleDelete(user.id, user.username)}
+                          className="px-2 py-1 text-xs font-medium text-danger hover:bg-danger-muted rounded transition-colors"
+                        >
+                          Verwijderen
+                        </button>
+                      )}
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          ) : (
+            <p className="text-text-muted italic">Geen gebruikers gevonden.</p>
+          )}
+        </div>
+      </div>
+    </div>
+  )
+}
+
--- a/src/vite-env.d.ts
+++ b/src/vite-env.d.ts
@@ -0,0 +1,2 @@
+/// <reference types="vite/client" />
+
--- a/tailwind.config.js
+++ b/tailwind.config.js
@@ -0,0 +1,48 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: [
+    "./index.html",
+    "./src/**/*.{js,ts,jsx,tsx}",
+  ],
+  theme: {
+    extend: {
+      colors: {
+        bg: {
+          DEFAULT: '#0f1419',
+          elevated: '#1a2027',
+          card: '#232b35',
+          input: '#2a343f',
+        },
+        border: {
+          DEFAULT: '#38444d',
+          light: '#2c3640',
+        },
+        text: {
+          DEFAULT: '#e8ecf0',
+          muted: '#8899a6',
+          faint: '#5c6d7e',
+        },
+        accent: {
+          DEFAULT: '#ff6b4a',
+          hover: '#ff8266',
+          dark: '#e85a3a',
+        },
+        success: {
+          DEFAULT: '#17bf63',
+          muted: 'rgba(23, 191, 99, 0.15)',
+        },
+        danger: {
+          DEFAULT: '#e0245e',
+          hover: '#f04070',
+          muted: 'rgba(224, 36, 94, 0.15)',
+        },
+      },
+      fontFamily: {
+        sans: ['DM Sans', 'system-ui', 'sans-serif'],
+        mono: ['JetBrains Mono', 'monospace'],
+      },
+    },
+  },
+  plugins: [],
+}
+
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -0,0 +1,29 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"],
+      "@server/*": ["server/*"]
+    }
+  },
+  "include": ["src", "server"],
+  "references": [{ "path": "./tsconfig.node.json" }]
+}
+
--- a/tsconfig.node.json
+++ b/tsconfig.node.json
@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "skipLibCheck": true,
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "allowSyntheticDefaultImports": true,
+    "strict": true
+  },
+  "include": ["vite.config.ts"]
+}
+
--- a/tsconfig.server.json
+++ b/tsconfig.server.json
@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "esModuleInterop": true,
+    "allowSyntheticDefaultImports": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "outDir": "dist/server",
+    "rootDir": "server",
+    "declaration": false,
+    "noEmit": false
+  },
+  "include": ["server/**/*"]
+}
+
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -0,0 +1,26 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import path from 'path'
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+  server: {
+    port: 5177,
+    proxy: {
+      '/api': {
+        target: 'http://localhost:4000',
+        changeOrigin: true,
+      },
+    },
+  },
+  build: {
+    outDir: 'dist/client',
+    emptyOutDir: true,
+  },
+})
+
				`@@ -0,0 +1 @@`
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